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Lexus RX 400h - MPG-Real World Numbers

311 messages,  Last post on Jul 08, 2009 at 3:52 PM

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What is this discussion about? Lexus RX 400h, Fuel Efficiency (MPG), SUV


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#288 of 311
Re: mpg effected by heater & by ethanol blended winter gas by jsobecki
Feb 03, 2008 (12:39 am)
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Replying to: cabbell (Feb 02, 2008 1:09 pm)

Hi,
 
I'm guessing the Toyota firmware is the same in your RX400h as it is in my Prius.
 
1) The heater does want to be ready to serve and hence the motor runs all the time during cold weather, particularly at stop lights and any acceleration at all.
 
2) Ethanol blends here in Colorado during the winter months at 10% lower my mileage by *exactly* 10%. So that's 2.8mpg less for you plus the heater...
 
Try taking a road trip to boost your mileage.. Seems to help over the city driving in the winter.
 
Good Day, John
#289 of 311
Re: mpg [cabbell] by kyxydj
Feb 03, 2008 (8:33 am)
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Replying to: cabbell (Feb 02, 2008 1:09 pm)

Yes, with the heater on, it makes your gas engine fire up immediately upon starting the RX 400h. And keeping the heater on for your trip will also keep the gas engine operating, when it might otherwise turn off. I've also noticed lower gas mileage on my 2006 RX 400h in the winter months, basically anytime it's under 65 degrees F. outside (I live in San Diego). If you live at 7,000 feet, your winter is probably much colder than here in San Diego, so you are going to see a bigger drop-off in mpg. The gas engine just seems to operate a lot more when it's cold outside. I am sure your mpg will go back up to previous levels once the outside temp. warms up!
#290 of 311
A Little Cold Water for the Averages... by brent99
Mar 03, 2008 (3:16 pm)
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I get up to 20MPG driving city and 23.5 on long trips (AWD). Car is over 20,000 miles, this has been pretty consistent during my ownership.
#291 of 311
Re: A Little Cold Water for the Averages... [brent99] by debbieandjon
Apr 04, 2008 (1:50 pm)
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Replying to: brent99 (Mar 03, 2008 3:16 pm)

Are these people talking about the same car? Could my results be lower because
of California's emission standards? The AWD feature uses electric motors on the rear wheels.
 
At 6000 miles, my overall average is 21 mpg according to the car's computer.
 
RX400h (AWD) 2007
#292 of 311
Re: A Little Cold Water for the Averages... [debbieandjon] by lansdownemike
Apr 06, 2008 (6:40 am)
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Replying to: debbieandjon (Apr 04, 2008 1:50 pm)

I don't mean to criticize anyone's driving habits, but for me, my average mileage can vary up to 3-4 mpg over a few hundred miles depending on the weight of my right foot. If I drive with my accustomed quick starts and quick moves into open spots on the lanes around me, I'll get 21 mpg routinely. If I take it easier, remember to feather the throttle more, and keep an eye on keeping the electric power engaged, I'll get 24-25 in suburban driving. For me it's usually a mix, so 23.5 over 14K miles is representative. It also is affected by how many short trips I take as the first 10-15 minutes of driving from a cold engine is rarely better than 20-22 mpg no matter how hard I try.
#293 of 311
Re: A Little Cold Water for the Averages... [lansdownemike] by debbieandjon
Apr 06, 2008 (8:47 am)
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Replying to: lansdownemike (Apr 06, 2008 6:40 am)

The "warm up" might be the factor here. (Yearly average outside temps 60° - 75°) My commute is six miles each way, about 15 - 20 minutes. Toyota does not explain this adequately and therefore is misleading the public with the mileage expectations. Nice car but it's not worth the additional cost in dollars
for pollutant and gas savings.
#294 of 311
Even MPG from the Atlanta area by kaperino
Apr 06, 2008 (1:28 pm)
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This car will not get greta milage on short commutes. But I am now going for my 55,000 mile this next week and I am still getting 26mpg. It's not the 28-29 once had, but I swithched from premium gas. I still love this car, the peformance the handling and it's ability to keep the pace. This is no Prius, but was not advertised to be.
#295 of 311
Great milage by nigh
Apr 06, 2008 (6:37 pm)
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My husband and I recently made a trip from Asheville, NC to Richmond,VA using I40. We used cruise control and averaged (by computer) 30.1-30.5 mpg. The outside temperature was 70-73F. We use regular gas. Our Lexus 400h is 2 years old. LOVE our Lexus. It is quiet, comfortable and is perfect for long trips.
#296 of 311
Lexus 400h 2006 mileage by dmbflorida
Apr 30, 2008 (8:00 am)
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I only have 20,000 miles in the three years since I bought the Lexus 400h 2006, forward wheel drive. I alternate the 400h with another smaller hybrid car. I love this car. I have gotten about 26 mpg in city and a bit more on the highway. I live in deep SW Florida and run the A/C almost all the time so that cuts down on the fuel economy. I use procedures I learned with my Prius to save gas and this helps.
I sometimes use premium regular gas and sometimes use less octane but never lower than 87%. The car still looks fab and it is so much more comfortable and safer than the smaller hybrid SUVs and Prius. I plan to keep this SUV for a long time. I will never buy any car unless it is a hybrid. I just bought a hybrid Tribute Grand Touring 2008 for a relative and this is a great car, too but smaller. The dealer I use in Fort Myers provides excellent service, free car washes, car loans and a genuine "white glove" experience.
#297 of 311
Re: Lexus RX 400h hybrid computer for MPG [gog8rsz] by karens2008
May 01, 2008 (1:14 pm)
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Replying to: gog8rsz (Oct 26, 2007 12:50 pm)

Can you please explain to a person who has no brain power for actually figuring out MPG manually how to do it exactly? Do you need to use up a full tank of gas and see how many miles you get out of it and then calculate? or just refuel after a trip and see how many gallons are used up?
 
if using the whole tank of gas then you run the risk of running out to deplete the gas tank don't you? Am i making sense??????
I really would like an accurate read of my gas mileage -- thinking of switching to this car -as my Acura MDX 2005 is a gas hog -- think i get 17 average, not awful but not good in this economy.

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