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Hybrid Vehicles Lexus RX 400h Lexus RX 400h - MPG-Real World Numbers
311 messages, Last post on Jul 08, 2009 at 3:52 PM
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I don't own a 400h; however, reading all of these posts makes me believe that people are putting far too much stock in their NAV readouts than in doing actual calculations of gallons used divided into miles traveled. I have a BMW which has a "mileage indicator" showing "actual" vs. acrued mileage numbers. NONE of them is ever accurate compared to figuring out what the REAL mileage is by filling the tank and dividing that number of gallons into the miles traveled. Too many variables as the car's computer is calculating all kinds of situations where you may be cruising economically for a long period, but then have the mileage killed by traffic or other circumstances. It figures out an average and displays that number which may be far off reality. While the "instataneous" mileage number from the NAV is interesting, take it with a grain of salt and figure your numbers manually. They will be real.
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Replying to: waph (Aug 12, 2005 10:50 am) Those of you experiencing poor performance might ask your dealers to try the ISC Learning proceedure which reinitializes the the idle speed control. It is in TSIB EG010-05. This is something that can be necessary if the 12 V battery dies (and possibly that happens during shipment or prep of some of the cars). Some of the things this can cause are poor fuel economy, engine running too often and excess noise at idle. I would really like to hear the results from trying this for some of you with poor mpg experience. Is your city driving all with a cold engine? I see a city MPG average of 22 when I do all short trip (less than 6 miles or so) driving. Other than that, with a lot of AC going I see about 24 mpg. Our average for the first 3000 plus miles (calculated based on gas purchases) was 25.4.MPG. We are running regular gas and performance has been fine with that. Last weekend we had it on a pull up a steep grade for the first time and it had plenty of power with regular so I have yet to figure out why the manual recommends premium for better performance. Eventually, I may try a couple of tanks of premium to see if I notice any difference.
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Replying to: pearl (Aug 12, 2005 5:44 pm) On the other hand, the average mileage meter on the car seems reasonably accurate. When I have let it run for a tank, it has been within 1 MPG of my calculated MPG. |
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Replying to: rx400_owner (Aug 15, 2005 11:37 am) |
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Replying to: KarenS (May 06, 2005 6:47 am) |
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| As I stated in an earlier post, my gas mileage in the city, with air conditioning running, in the hot San Fernando Valley is about 31 to 32 mpg IF I discount the first five minutes. Does anyone know why the first five minutes of driving causes such a nose dive? It is really devastating to an overall average if one is constantly making short trips. | |
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600 miles -- air on all the time (this is Tucson, you know) and average is 26.8 mostly urban driving, some interstate but not much Today I also scratched the rear hatch. It went up as the garage door opened (I've got to figure out the key buttons better, it seems) Estimate for two small scratches on the rear hatch is $430. Have to repaint the whole back section and replace all the markings. The little Lexus name on the back is $57 to replace. Gives you the idea. The whole thing is two scratches about 1.5 inches long. |
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| I did that to my 99 Ford Exploder when it was only a few months old. Small scratch in rear hatch and bumper was close to a grand to fix. They have to repaint the whole rear hatch and clearcoat it. While the ford badges were off i had them replaced with M5 BMW tags. Most people thot it was funny, almost made the whole thing worth it. | |
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I had been in the waiting list for this car for sometime and wanted to test drive the car but everytime the dealer refused saying the car was already sold. Finally found a dealer that had a demo and let my wife and I to test drive the car. The first thing I noticed sitting in the back was the buzzing noise when the rear generator kicked in, very annoying. Second was looking at the on board display real time mileage, noticed that the gas mileage never went over 25 MPG as we were driving the car (except if you let go of the gas) and in most cases was below 20. The turning point was when I saw the trip computer (around the speedometer cage) showing 450 miles with 16.8 MPG as the avg run rate, I guess it is not very smart on the dealers part not to reset that often or turn it off during test drives (may be that's why they don't do test drives  ) That is not any different than older SUVs. Granted many owners on this forum are getting better MPG than that but IMHO if you are considering getting one of these just for the gas mileage you may end up disappointed. Two other points, this car most likely would not qualify for the car pool lane at least not in California even if the law passes since the gas mileage is low so no bonus points for that, second a quick calculation tells me that my $ savings on gas with this car would be approx $750 per year (assuming 20k miles per year so if you drive less your savings will be lower, also assuming $3/gallon gas).  At that rate it would take me over 13 years to get the $10000+ premium that this car requires. Needless to say I'll be getting my deposit back this weekend. Compare the price and gas mileage to other popular SUVs like RX330 or MDX and decide for yourself.
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Replying to: bravoq (Aug 19, 2005 11:33 pm)
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