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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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Replying to: gog8rsz (Oct 26, 2007 12:50 pm) In the NY-CT area on 87 octane we average 26-27 mpg, and 28 mpg if we take hour-plus trips and stay below 70 mph. I tried one tank of 91 octane last spring and mileage seemed to be 1-2 mpg higher, but that doesn't do more than pay for the higher price so we use 87 octane. Speed makes a big difference--even if our mileage indicator has not been reset for over 200 miles, if we get up to 75 mph you can see the integrated mileage number drop in a matter of minutes. |
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Had the rx400h for 6 months and very pleased. I can get 30 mpg on the computer driving carefully with a mix of highway and city driving in warm weather here at 6000 feet elevation using premium fuel. My wife likes higher g forces and gets closer to 27. Anyone else have experience at altitude? An earlier post on this forum describes it as effective to accelerate quickly to speed and then take the foot off the accelerator quickly to engage the electric motor and that this strategy enhances fuel efficiency. Physics seems counterintuitive, but maybe that's the way the car's computer is programmed. I should think that it would be easy enough to "tune" the software for better performance or better fuel economy. I'm a little surprised that this is not possible for the driver to do as a matter of individual preference. Maybe next year. 
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We were worried that our 400h might never consistently do it, but after 6k it all of a sudden jumped to 29-30.5 mpg with mainly stop and go city driving. Interestingly, it was our first tank of mid octane; we had always used premium before. It definitely declined during cold and rainy weather, but that may be because we were driving differently. We love the car in all ways, except I can't wait until it becomes a 7 seater ('10, I believe). 
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Replying to: dorenescar (Jan 19, 2008 7:43 pm) |
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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. |
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Replying to: scarfoot (Nov 19, 2007 8:34 pm) 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? |
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Replying to: driver777 (Jan 13, 2006 11:50 am) 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.
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Replying to: cabbell (Feb 02, 2008 1:09 pm) 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 |
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Replying to: cabbell (Feb 02, 2008 1:09 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.
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