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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've had the '07 RX 400h for 4 months and have 6200 on the odometer. The computer shows that I'm getting 25.6 in town and 26 on the road. This is in flat Florida. In the montains of NC the computer says I was averaging 29. I'm a conservative driver and strive for maximum MPG. To check the accuracy of the computer around town, I did a manual check on the MPG, dividing the miles travelled by the number of gallons to fill-up. My calculation revealed actual MPG of 22.3 against the computer average of 25.6. Has anyone else done a similar validation? I really enjoy the car, but would be very disappointed if the computer actually overstates the MPG. | |
I've found that the MPG computer in my 2006 RX 400h is fairly accurate, although I have a friend who says the one in his Prius is "optimistic." I find that a "manual check" of my miles per gallon can be an inexact science, depending on which pump, at which gas, station I am using. They all seem to shut off at different times when they think my gas tank is full. But when I've worked out the MPG "manually" I've found numbers higher and lower than what the Lexus computer says, so I'd say it's pretty good. BTW, I stopped resetting my MPG computer at each fill up; I now have driven almost 3000 miles since my last reset, and the average MPG is holding at 29.0.
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Replying to: kyxydj (Oct 04, 2007 1:18 pm) |
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Replying to: kaperino (Oct 04, 2007 3:40 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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