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Lexus RX 400h - MPG-Real World Numbers

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

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#285 of 311 Lexus RX 400h mileage by sjamar Feb 01, 2008 (7:48 pm)
Just picked up my 2008 RX 400h -- love it. Mileage will improve after a few thousand -- as happened with the Honda Insight, Honda Civic Hybrid, and Prius, I'm sure. But already getting 25-28 on various trips around suburbia and commuting into DC. I brought it in for a day for XM and hitch installation -- and had an RX 350 loaner -- and it had 19.5 mpg over 13,000 miles and I just got about that for the day, I think. Anyway that is some 25% bonus for hybrid.   Will by trying regular fuel next tank. $.30 differential doesn't seem worth it if no engine damage from 87 octane. Manual says it will run on it. And even says to use 87 octane with ethonal blends. Can't claim to understand it all.   Like the car. First car I've owned all tricked out like this.
#286 of 311 Re: altitude, mileage, tuning the computer [scarfoot] by cabbell Feb 02, 2008 (12:56 pm)
Replying to: scarfoot (Nov 19, 2007 8:34 pm) I live at 7,000 feet and have had a 2007 Lexus 400h for 11 months. For the first nine months I averaged between 28 and 30 mpg on regular gas. For some reason, I've been averaging only 22 to 23 mpg for the last two months. Still buying gas at the same place and no change in driving habits. The dealer says nothing is wrong and refuses to do anything. Have you heard of any problems like this?
#287 of 311 Re: mpg [driver777] by cabbell Feb 02, 2008 (1:09 pm)
Replying to: driver777 (Jan 13, 2006 11:50 am) I have exactly the same problem you mentioned.   I live at 7,000 feet and have had a 2007 Lexus 400h for 11 months. Current mileage is 9,500.   For the first nine months I averaged between 28 and 30 mpg on regular gas. For some reason, I've been averaging only 22 to 23 mpg for the last two months. Still buying gas at the same place and no change in driving habits. It's impossible to drive even 4 mph without the engine turning on. But for the first 9 months I could drive 20 to 30 mph on electric power alone.   The dealer says nothing is wrong and refuses to do anything. Have you heard of any problems like this?   Incidentally, it is winter here and I thought perhaps using the heater would require the engine to stay on. So I turned off the heater for about 20 miles and started monitoring mpg from zero. I ended up with 22.4 mpg. Replies to this message: jsobecki (Feb 03, 2008 12:39 am) kyxydj (Feb 03, 2008 8:33 am)
#288 of 311 Re: mpg effected by heater & by ethanol blended winter gas by jsobecki Feb 03, 2008 (12:39 am)
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)
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)
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. Replies to this message: debbieandjon (Apr 04, 2008 1:50 pm) lansdownemike (Apr 06, 2008 6:40 am) debbieandjon (Apr 06, 2008 8:47 am)
#291 of 311 Re: A Little Cold Water for the Averages... [brent99] by debbieandjon Apr 04, 2008 (1:50 pm)
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 Replies to this message: lansdownemike (Apr 06, 2008 6:40 am) debbieandjon (Apr 06, 2008 8:47 am)
#292 of 311 Re: A Little Cold Water for the Averages... [debbieandjon] by lansdownemike Apr 06, 2008 (6:40 am)
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. Replies to this message: debbieandjon (Apr 06, 2008 8:47 am)
#293 of 311 Re: A Little Cold Water for the Averages... [lansdownemike] by debbieandjon Apr 06, 2008 (8:47 am)
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)
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.

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