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Lexus RX 350 Real World MPG



  • I would guess new model will be released in approx 7 months as 2010 model, so you should wait.
  • sxylxysxylxy Posts: 29
    I owned a 2007 RX350 for 3 years and never went below 16 mpg around town. My 2010 is only getting 14.5 around town, same driving style, and I'm on my 3rd tank. Any ideas? I know this model is heavier, but it's rated HIGHER on the city mileage than my old 2007. Anyone else experiencing this during "break-in" and does it get better?
  • ds456ds456 Posts: 1
    This is my 4th Lexus. I've had a hybrid and an RX 300. My new FWD 350 is 3 months old and I can't get more than 11 or 12 mpg with city driving. I take off slow, keep my speed down, etc. It's the worst mileage I've had with a Lexus. My '06 rx300 used to get 17 or 18 city. I'm trying premium gas and it's still low. Anyone else having this experience?
  • Real World mileage 96 RX330 @ 70,000 miles. I use nothing but regular grade 10% ethanol here in Florida. I drive 80% of my trips at less than 50mph. This truck? gets 19-22.5 in town. When I drive to Orlando a trip of 60 miles, at 70-75 mpg I get 25-28 mpg. If I drive 80+, the mileage drops to 22.5-24 mpg. I check the computer readout against the measured mileage and gallons to refuel. The computer is less than .5 mpg off in either direction. I did try premium on a trip this past summer, and saw little difference. It has been my experience (300,000 miles of driving newer model cars) the if you want full power for passing and off the line then you need the premium for max engine power. The knock sensor will drop effective hp by 5-20 hp.
    So around town all I need is 200 hp to get the vehicle moving from a light. IN flat land (Florida has few hills) Regular gets me across the state easily.
    Sorry for the long winded answer, but hope the extra info helps.
  • cecartercecarter Posts: 7
    I don't know what your speed limits are, but I do my best to rapidly get into 5th gear at 40 MPH. Then Watching the mpg readout, I can see 3-5-7-13-to 28 mpg. I don't floor it to get there, just 2500-3000 RPM shifts. Top gear is most economical, so get there quickly, dont spend a lot of time in lower gears.
    Tire pressures at 30psi? Check every 2 weeks. I run mine at 33psi.
    If you are still getting lousy gas mileage, take it to dealer and get diagnostic check. Maybe the catalytic converter is clogged. I haven't seen 11 mpg since I sold my 71 500 HP Ford Country Squire wagon. I could pass anything on the road except a fuel tanker truck. My RX 330 gets 19 - 20 mpg local driving. 24+ on highway as long as I keep it under 80 MPH.
  • I've had mine for over a year and I get 19 city and 28.5 hwy on average with 91 oct.
  • I have been disappointed with the gas mileage in my 2010 RX. For instance, in the
    '07 RX, just going back and forth to work, 6 miles each way with some errands thrown in, I would fill up the tank every 7 to 9 days with a quarter of a tank left or a little bit less. With the 2010 doing the same type of every day driving, I'm only getting 6 or 7 days out of my tank.

    I do make three or four trips a year to visit my family, a brother in Marathon, FL(Fl Keys) and my mom in Homestead, Fl. With the '07 RX, I could go all the way from Tampa to Marathon on one tank of gas with about 35 to 40 miles to empty. With the 2010, I could only make it to Mom's house in Homestead(about an hour-and-a-half time between Homestead and Marathon) with 50 miles to empty. So I definitely cannot make it to Marathon on one tank in the 2010.

    When I fill up the tank every week, the 2010 shows my cruising range to be between 302 miles to 317 miles. In the '07, my cruising range after a fill-up would be anywhere from 316 to 345 miles to empty.
  • Have you ever actually calculated the mileage by dividing the number of miles you drove by the number of gallons you purchased? Your post just seemed to be talking about range--how far you drove on a tank. I'm not sure, but it might be the case that the 2010 tank is smaller than the tank on the 2007. If that is the case, then your range would be less due to a smaller tank capacity. It is also possible that your new vehicle's engine isn't quite broken in yet. How many miles are on the 2020? It might start to deliver better mileage with a few more miles on the odometer.
  • I got 24.5 - 25 mpg on a trip recently (filled twice, 850-900 miles, 3 adults + one 5 years' child + luggages, almost 90% nonstop highway).

    Actually, around 21 - 21.5 mpg, 70% highway but it's more 30% since there's lot of traffic and I'm jammed most of the time.

    Still, pretty good numbers here, so I'm very pleased :) Better than my Highlander LTD 2002 (V6)

    +/- 41500 miles, RX350 2008 Premium + 18"
  • wcs1885wcs1885 Posts: 15
    How do I find out the exact mpg on my RX? Is there a way to look it up? I just got this car a week ago w/ 8 miles on it. In a week I've got ~200 miles on it. I bought it from the dealer w/ a full tank of regular unleaded & now I'm at 1/4 left in the tank. If I'm not mistaken there's 19 gallons in it & Imust be getting terrible mileage at this rate...? I drive to/from work, 80% highway & 20% city, so I "should" be getting better mpg(?). I dont drive crazy... I accerlerate & stop gradually, but I do go 70-80mph on the highway which (lets just say isnt the speed limit). Does that make THAT big of a difference? I thought I should be getting at least 300-400 on a full tank of gas. Please let me know what I'm doing wrong or what to do.
  • kyfdxkyfdx Posts: 70,555
    You can't figure MPG by looking at your gas gauge.... We don't even know if the dealer filled it all the way up.. just that the needle was on F.

    Fill up your the trip odometer.. drive it until it is near empty... then re-fill it, noting the number of gallons... Miles/gallons = MPG.

    That is the only reliable way to check your fuel usage..

    Also, if your vehicle recommends premium, then use it!



    Prices Paid, Lease Questions, SUVs

  • wcs1885wcs1885 Posts: 15
    Is there a way to see what the car is calculating my average speed or mpg is? My husband's Honda Odyssey does that and I've been trying to figure out the gizmos in mine to see if it will too.

    With gas prices the way they are now, I doubt they'll be going down anytime soon so I guess I'll fill 'er up and see how much the car gets. I'm hoping for 400miles per tank to average out at 20mpg. Anyways, what's everyone's opinon on using which type of gas (87, 91, or 93) and how has it affected your mpg?
  • I too have had 4 previous Lexus SUVs. My wife just bought a new 350RX and, like you, cannot get any better than 10-12 driving around the area (city). When we take it on the highway, the best was 15 miles per gallon. But we have an even stranger problem. If she does not drive the car for 5 days (which sometimes is the case when we go away), the car does not start. Anyone ever hear of this? Bottom line, they are advertising falsely (no surprise there).
  • wcs1885wcs1885 Posts: 15
    I put 1000 miles on my 2011 RX350 since Feb 26th. So far my average gas consumption is 18.4. For every refuel at the pump... I get 270 miles before I have to visit the gas station and I average about 20 miles per gallon and so far I've only put 13 gallons everytime I refuel and I let it get down to about 1/8th of a tank. I dont see how anyone can get over 20 between city & highway.
  • cecartercecarter Posts: 7
    I have a 2006 RX 330. I average less then 10,000 miles/year. most of my driving is local, less than 12 miles, and as short as 1 mile 6 X/week. I have tracked my mileage since i purchased my car and the average has been 19 local, and as high as 25 on a 400 mile trip.
    the car has a fairly high battery drain because of accessories. have the battery checked, and upgrade to a higher capacity or get a plug-in trickle charger.

    The computer mileage is very close to the logged mileage.
  • fernsferns Posts: 4
    I have a 2010 RX 350 and get 18 MPG City and 26 MPG on High way. Filled gas full and started the calculation with coninuous 3 times filling gas full to empty and dividing the total Miles travelled by the gas quanitity and get this average. One point to note is that you need to ensure that the ECO light is maintained ON to get the best mileage. I have tried with premium 91 and regular 87. There was not much difference in MPG.
  • fernsferns Posts: 4
    One more note to add: Premium Gasoline can be 'Required' or 'Recommended'. For 2010 RX 350 Premium is 'recommended'. There is no difference in gas mileage hence no need to use it.
    Only difference will be that you will lose half a second while take off from zero to 60 miles in 7 seconds. So, if you are on the race track then you will need Premium.
  • cecartercecarter Posts: 7
    Since you have a 2010, what does the ECO mode do? What I wqould like is the capability to upshift at lower speeds like I had in my Mercedes 230 Compressor. I could select 5th gear at 20 mph.
    Is ECO just a light or a switch?
  • kwbuggykwbuggy Posts: 11
    It is just a light which illuminates when you are driving economically. If you try to keep it lit up at all times you will improve your fuel economy significantly.
  • I recently purchased my fourth Lexus RX. Previously owned a 2000, 2004 & 2006 hybrid. While the mpg for my new car is not quite as impressive as with the hybrid, overall I get 22-23 mpg with a mix of city and highway driving in mountainous terrain. The car has about 2000 miles on it right now. What I lost in gas savings I gained in insurance premiums savings, as my annual premium has decreased by about $500!
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