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Infiniti G35 Real World MPG
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Comments
I'm lost....I worry that a warranty repair will have them check the fuel and bust my stones about the gas....but I just don't get it.
I will continue to use other premium gas from new stations to see the effect.
As to using lesser gasoline, I'm not doing it b/c the gas fill door/Manual says exspitcitaly (sp) () premium ONLY. That's my opinion. And I want all the power my car has available to it. That's why I bought it! Safe travels... Jay
On the highway, its a different story. Going on trips up to and from Louisville, KY my mpg has been around 21-22. Very good to me, once again running the car out a bit. : )
I still have no clue why I get better mpg on reg than premium from the same station with the same horrible ethanol in it. :confuse:
None of us bought this car for fuel mileage, driving in snow, or hauling a lot of passengers and stuff. Nor did we expect it to be among the fastest on the road.
Dollar for dollar, this car does a lot of things exceptionally well. And day in and day out it is pleasantly functional for what it is. Slap on some Blizzaks and it can be driven year round, albeit with a serious degree of conservative driving.
One poster said it best when he suggested taking an uninterupted highway trip over 100 miles, stick it on cruise at the speed limit, and then report back. His point was simply this. The car can achieve reasonable if not surprisingly good highway fuel mileage.....altitude/grade, low temperatures, and ethanol content notwithstanding. If you can't coax a highway 26 MPG out of this car, you need not look any further than your right foot and driving habits.
Those of us who report 27-28 MPG highway are not pulling your leg. Last month on a vacation to the White mountains of NH, my wife and I got a round trip highway average of 27. My SIL and daughter followed us with 2 passengers and luggage in his Nissan Quest, and he got 25! He was amazed and finally had to admit that THE MILEAGE PROBLEM WAS HIM!
Fooling around on the mountain twisties, brief blasts to 120, and simply enjoying the car while "there," was a different story. Sure, I got 13 mpg, easy. And it sure was fun doing it.
21 mpg in mixed conservative driving is normal for me. Pure around town mpg with traffic makes 18 mpg a moral victory.
Stop worrying about the fuel mileage and start enjoying what you paid $39K for.
Jack
Thanks, Jay
Someone else commented on their G's gas tank capacity @16 gallons !?! The 04 Coupe is rated at 20 gallons. I put in as much as 18.5 gallons a couple of times (miles to empty read --- or 0). But I stopped running the tank down when another poster noted that the fuel pump depends on fuel to remain cooler during operation.
My wife is back to driving the car daily (mostly highway), so I am happy to report that the fuel mileage plummeted back to 21 mpg from the pure 26+ highway I previously reported from our vacation last month. The lower fuel mileage she gets is worth the price because I can tease her about her lead right foot. Her response is: "I paid for the horsepower and I am going to use it, all of it!"
Enjoy,
Jack
Also, thank you for sharing the crash scenario with us. A lot of us assume all cars are created equal with regard to crash safety, or we give that aspect little weight when selecting the car.
Can you share what brand and size tires you have, as well as the tread remaining? Hydroplaning in real world driving is a fact of life; and many of us who opt out of Summer tires when it is time for replacement are in the hunt for an acceptable compromise, willing to give up some dry pavement grip for an increase in better inclement weather performance.
I started another thread on winter tires since @ 30,000 miles my OE Michelin PS Summer tires are cooked, and in New England we get snow. Main Topic: INFINITY G35 COUPE Subtopic: G35 Coupe in the snow. . This winter I can't just garage the car and will have to use the G Coupe as a daily winter driver for the first time. I would appreciate it if you and others would share your winter driving impressions, especially those that have switched to either an all season tire or a dedicated set of winter tires.
Again. Glad you are intact and that the car can be repaired.
Jack
Thanks for your well wishes. I'm sure she will be good as new when repairs are finished.
Jay :sick:
My averages over 1659 miles and 5 fill ups:
Based on the computer - 20.3 MPG @ 31.7 MPH
Based on mileage, computer time, and gallons bought - 20.2 MPG @ 28.8 MPH
Given the EPA combined estimate of 19 MPG, I can't complain.
Yes, I'm happy with the computer accuracy, paulo6. I've never had a car that was within 0.1 MPG of my calculation. I just noticed that I had a 15 hour error on my first fill up (duh!). My earlier 28.8 MPH was wrong. It should have been 31.7 MPH. Come to think about it, that number is meaningless, as it is based on the computer's mileage and average speed. It should always match the computer (duh!).
I have noticed that if I top off the tank, the MPH will be a tad bit lower than the computer on an individual fill up. If I simply stop when the station pump cuts off, the MPG has been accurate to within 0.1 MPG. I suspect that this means the computer bases it's calculations on the useful capacity of the tank (actual volume minus the space needed by the fuel to keep the fuel pump submerged minus the remaining volume when the station pump cuts off).
As I mentioned in a previous post, I ran 89 when the gas prices topped $4 per gallon. I did it for a period of a couple of months, and the fuel economy remained at least THE SAME. Perhaps the fuel prices toned my driving down a bit. I'm back to 93 because that is the next octane above 89 available in name brand gas that is marked "premium" in my neck of the woods.
But many posters wonder what impact the drop in fuel grade actually has on performance. The 04 Coupe owners manual says 91 for max performance. So how much does the performance actually drop off with a reduction in octane? I've never seen this tested or measured in car mags, etc.
My wife was reading up on the new Hundai Genesis (worth a look) on the Hundai web site. Under the specifications section (I believe) it provided both horsepower and torque for the standard V6 and optional V8, for "premium and regular" fuels. I was amazed to see the two ratings.....never saw that before for ANY car.
Guess what? With a drop to "regular fuel", hp and torque fell off about 5 each, not much on a V8 cranking out horsepower in excess of 350 (on a Hundai! Don't quote me on the 350, I think it was actually higher!).
It has been written that the higher octane fuels don't do what you might assume, boost performance noticeably. The Hundai specs confirm this. Octane's primary purpose is to prevent detonation during the combustion cycle. That's it.
So using an octane higher than "recommended" or "required" by the manufacturer does nothing more than drain your wallet because there is no appreciable gain in either fuel economy or statistical hp/torque ratings. If you think about it, 5 hp on a base of 280 hp (the 04 Coupe) is about 1.7%. On your newer Infinity which probably has 306-337 hp, the percentage is less!
Wish some lab rat would jump in here and add some statistical fact to our anecdotal discussion.
Jack
I have a wife, so sitting in a parking lot at a mall with just ignition on just the accessory position and listening to a ball game is not uncommon.
Jack
My mechanic advised not to run the tank down to ------- which is 0 miles to empty. The in-tank fuel pump uses the fuel to remain cool. Other than make sure you never run out of gas, that may be the reason for all the advanced warnings (light and DTE).....to protect the fuel pump. If you ever had to get a new fuel pump in a car where the gas tank has to be dropped to replace it, you many want to think twice about running the tank down to DTE-------too many times. Expensivo!
Jack
You noted you live in Colorado at an elevation above sea level of 6,600 feet. You might find some interesting information in your owners' manual under "Fuel Recommendations." There is a subsection about operating the vehicle above 4,000 feet......at least there is in my 04 Coupe manual.
Jack
My 04 G35 Coupe's owners' manual states a fuel recommendation, not a fuel requirement. Is that because the 306hp and 330hp engines actually require a higher octane rating? Could you check your owners manuals on that?
Thanks,
Jack
Look at it this way....after that durango...you'll enjoy your G's MPG lol
Second, I was wondering if at your altitude of 6,600 feet above sea level that the altitude and rarified air has a negative impact on the fuel economy. Engine management systems can and do adjust the fuel/air mixture to accommodate for the reduced oxygen in a given amount of air by adjusting the fuel component. This is more of a "protection" adjustment to prevent detonation and control engine operating temperatures. But completely overcoming or compensating for the reduced oxygen content? I don't think so. I would expect fuel economy and acceleration stats to be adversely affected, regardless. Someone who knows more about this stuff than I do.......help us out here.
Finally, if you are looking for an all season tire replacement instead of snows, you may want to read my thread on the G35 Coupe in the snow. Main Topic: INFINITY G35 COUPE Subtopic: G35 Coupe in the snow. Guys with RWD and AWD Infinities and other makes have responded with their experiences and recommendations, some tire brand and tire model-specific. I have a RWD Coupe, live in MA. (snow), and am looking to switch to an all season alternative myself.
Have spent considerable time on the NTB website reading tire owner survey opinions, 13 different road condition stats, and expert road tests with a concentration on Infinity and BMW owners' experiences.
My choice at the moment is the Bridgestone Potenza 960, and about 100 pounds in the trunk during the winter snows. While winter tires would be optimal, I can't bring myself to dedicating a $1,400+ set of rims and tires to accommodate the half dozen days a winter where I might get 6+ inches and road crews falling behind. Then I have to buy a new set of tires $900+ next March for the Spring, Summer, and Fall.
At the rate the G Coupe chews up tires, irrespective of one's driving habits, it is looking like MPG and fuel expense is not far ahead of tire expense on the concern list.
Some folks don't worry about total ownership expenses (taxes, insurance, depreciation, fuel mileage, tires, reliability/repair associated expenses, etc.). Some do.
When you pick up your car, don't forget to bring the searchlight and magnifying glass to examine the repairs. Bring an anal/retentive nitpicking friend along too.....they can be helpful once in a while.
As I have AWD I am not going to get snow tires, per se. Just something with a little more wet grip. I ran my OEM tires through a horrendously heavy snow year last winter and I was quite pleased with the results. So a small upgrade would be just the ticket. Thanks again. Jay. :sick:
Trip computer averages 16 or so MPG and it seems to be pretty close to actual
insights??
Second. I've read in Edmunds and other places that the best fuel economy for cars lies within the 45-55 mph range. All things being equal, that's primarily due to wind resistance. Above 55 mph, wind resistance takes more than a simple straight line, algebraic toll on fuel economy.....at some point, for example, an increase in cruising speed of 10% will take more than a 10% toll on fuel economy.
That is why a G35 will hit 155 mph (electronically limited) with 280-330 hp. But take off the electronic speed limiter to achieve 200 mph? The G and other cars would need to double the horsepower to gain that last 45 mph! Read Car mags' annual 200 mph shoot-outs. 500 horsepower isn't enough! You can translate that increase in required power and fuel consumption for small incremental top speed drops all the way back to 55 mph.
Third. You are driving an awd vehicle. I would assume that with the extra weight and more moving parts (versus my rwd Coupe), your mileage will always be 5%-10% less than a lighter car rwd G with less moving parts.
Now would be a great time to get a basis point for your car's (highway) mileage. I would suggest you take a 100 mile uninterupted joy ride on cruise at 60-65 mph once the car is warmed up, light or no traffic that would disturb your test. Set the cruise and reset your mpg once at cruising speed and that's it. Leave the accelerator alone! If it becomes necessary to disengage the cruise and then re-engage, stay EASY on the accelerator to get back to speed. I'll bet with your new car that isn't broken in that you'll still see 24mpg or more. Once broken in, the car is very capable of meeting or exceeding the EPA highway number.
In the city, pure city driving, another story. I have to baby my car to get 18-19 mpg. One blast from a stop light and the mileage begins it's plummet. Simple aggressive driving (not all out), and the mileage plummets. I get 15-16 mpg with MY normal city driving style.
The accelerator and your right foot hold the key to higher fuel mileage. I've written in other threads here that fuel octane (91-93 versus 89) has had no discernable effect on my fuel mileage. As for developed horsepower from an engine when changing octanes/fuel grades......Check out the Hundai web site. They provide horsepower and torque differentials for the new Genesis at varied octanes. The difference is surprisingly quite small. Off the top of my head, 1.5-2%!
So if you want to see higher fuel economy figures, the answer is in the break in, speed, vehicle weight, and your driving style.
There is no shame in resisting that accelerator. So few of us, however, drive the G for fuel economy. But it is nice knowing the car CAN achieve the city and highway fuel mileage the manufacturer claims.
On a vacation this past August I got around 27 mpg to get to my destination, and somewhere around 13-14 mph tooling around. My son in law was stunned at the difference and asked what happened. "My right foot, that's what happened."