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Lexus RX 350 Real World MPG



  • mss443mss443 Posts: 10
    I have a little more than 2500 miles on my RX350. With full A/C and using the mid grade gasoline (89 octane rating), I consistently get 26 miles and without A/C I get about 2.5 MPG. With 91 Octane, I got about a mile more than the above. The figures are based on a round trip of a total of 450 miles on the same day in I-80 (NJ-Pa.) (i.e., the route was not a flat one.) [I did not have to fill up the tank in between – NJ is a mandatory full service state and the gas is cheaper in NJ than in Pa.] For most part, the car was on cruise control at 69-70 MPH. Except for a couple of toll stops, the car was on full cruise throughout the trip. The usage information on the vehicle computer does not appear to be reliable – the vehicle computer indicated about 1.5 to 2.0 MPH higher than what was really achievable. In the combined city/highway driving, I get anywhere between 18 to 21 MPH depending on the drive segments. I am reasonably happy with the gas mileage I am getting from this car. To this date, not a single problem that I could think of.
  • davesuvdavesuv Posts: 149
    Our RX350 AWD has about 7000 miles. Around town with all city driving we usually get between 18 and 19 mpg. With a light foot, you can stretch this to almost 20. We just came back from a trip. On expressway, we were getting 29 to 30 at 65 mph. (Highest sustained mpg on the computer was 30.6). At 70 mph, we got 28.5 to 29. Always use 89 octane fuel.

    Have not done any real world calculations yet. All above mpg are from the trip computer with the Nav system.
  • Update at 5000 miles: Overall average has been 20.5 mpg. During typical daily 18 mile commute of 60% highway and 40% local roads or jammed highways, I get very close to that overall average. On longer, highway-only trips (typically avg 70 mph), I get 24 to 25 mpg. Just around town brings mileage down very quickly to around 17-18 mpg. This data is based upon manual calculations after fuel fill-ups. Computer reading (with Nav system) is pessimistic up to 20 mpg (true mileage is better than computer), but then the computer is optimistic above a reading of 22 mpg (true mileage is lower than computer). Just drove another RX350 as a loaner during service call and that vehicle had a wildly optimistic computer reading of nearly 28 mpg for mixed driving. So don't always believe the on board computer - measure it yourself after each fuel stop. After using all grades of gasoline I have settled with 89 octane mid-grade as the best compromise, getting slightly better mpg than with 87 octane and with no noticeable difference in mpg or performance compared with premium. Great vehicle thus far!

  • In regard to the mpg on the trip computer, I
    try to go by the the second number that says
    "average", the one that doesn't jump up and down so easily. I took a trip from Tampa,FL
    to Blairsville, GA this past week and my highway mileage averaged around 28 mpg. One time it even went up to 31 mpg for about five
    minutes. I didn't expect to get as good of
    gas mileage driving through the mountains.
    I guess with all the coasting and usually going
    at a speed less than 55 mph made a big difference. I was very pleased with the gas
    mileage on this trip. Unfortunately, in-town
    driving at home in the city goes down quite a bit.

    Before I left for my trip I was averaging around 17.5 mpg's driving around town. As of
    today, since I've been back, the computer has
    dropped down to 24 mpg. I expect this to drop
    some more as I get back into the routine of
    driving around town.
  • I've had my 350 for over 4 months now and get pretty close to the posted mpg ratings. For straight highway driving at ~70mph, I get 21mpg. The trip computer is consistently 0.5mpg more than what I calculate.

    I don't see how people are getting 30mpg on the AWD model. At best, I will get 22mpg on flat highways with no traffic.
  • Mine isn't all-wheel drive. It's a two-wheel
  • I got my RX350 2 months ago and had the first chance to test the MPG on highway last week.

    From Buffalo to State College, PA thourgh 219 highway with speed between 55 - 65 MPH, the computer showed 28.5 MPG and the real milage calculated by fill-ups was 27.4. Return trip through I-80 -> I-79 -> I-90 at speed around 75 MPH. The computer showed 25.5 MPG. Calcuating from fill-ups, the real MPG is 24.

    I got 22 MPG in the highway/city mix communting from home to work.

    Use 92-93 gas.

    Not too bad for a suv.
  • 150mphclub150mphclub Posts: 317
    The door gives the recommended inflation for the car you are driving. The tire gives the maximum inflation to avoid blow out for any car the tire is mounted on.
  • gulfagulfa Posts: 1
    I am willing to buy RX 350 now, but i feel that the new RX 2009 is coming next year. Once the new model arrived your car become old. I do not know to wait or buy now.I would apprecaiteany recomendations.
  • I was just reading on AOL this morning a clip from Car and Driver
    naming the top most fuel efficient Luxury SUV's. Of course, they
    quickly eliminated the RX350 from the group by trying to limit the
    top tier price of the cars. They said that the car had to be over
    $46,000 for the top of the line model and the RX400h came in only at $43,000. I had to laugh at this one since we all know this car can climb over $43,000. But I think they did this 'cause they
    know the RX would have beaten all the listed Luxury SUV's, Mercedes, Infiniti, Cadillac and such when it comes to overall
    fuel mileage. I guess they're tired of the same old broken record, so they had to skew the results somehow.
  • 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.
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