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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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#249 of 311
Re: More Mileage Info [rockville1] by apg97ss
May 20, 2007 (5:23 pm)
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Replying to: rockville1 (Mar 14, 2007 9:26 am)

hello Rockville1
maybe you recall we bought our RX400s on same day, same dealer.
No surprise, but driving styles can make a big difference. My wife likes the feel of G-forces, so she gets about 26. I try to ease into it - I use the visual of not trying to smash marshmallows if they were on gas pedal. whimpy i know, but i get 29+ combo hwy/town. a few times i have tried to really go easy to keep it on electric only as long as possible (and took battery bars down to purple). that experience gave me 32 mph around town. so lesson is, mileage varies by driver, and yes, cold weather did lower mileage.
unscientific, but if i had to peg a 'real world' number under 'normal varied conditions, with avg driver' i would put the rx400 at about 27 mph.
glad you enjoing the RX400.
#250 of 311
Re: More Mileage Info [apg97ss] by kaperino
May 21, 2007 (3:10 am)
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Replying to: apg97ss (May 20, 2007 5:23 pm)

Yes, however attempts to blend in your fuel tank should be carefully planned.
 
You should not allow the tank to become empty, and then add 50% of lower octane, followed by 50% of higher octane. The fuels may not completely mix immediately, especially if there is a density difference. You may get a slug of low octane that causes severe knock. You should refill when your tank is half full. In general the octane response will be linear for most hydrocarbon and oxygenated fuels e.g. 50:50 of 91 and 95 will give 93.
#251 of 311
Re: More Mileage Info [kaperino] by 150mphclub
Jun 05, 2007 (4:43 pm)
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Replying to: kaperino (May 21, 2007 3:10 am)

You can put 87 octane in a Lexus. It will not knock, because the engine computer will retard the spark to prevent it. The worst that will happen is you will suffer a small loss in power and/or fuel economy.
#252 of 311
Over 12000 miles by brent99
Jun 07, 2007 (7:05 am)
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We're lucky to get 20, but the car is driven locally in an area that seems to force bad mileage (long hills, traffic) and a car its size would be lucky to get 15 with the same workload. It gets about the same mileage as a small-sized Suzuki SUV with about 10x the engine power.
 
I tried premium one time and the mileage actually went down, so I won't do that again. This is still about a 20% to 30% gain on fuel economy, so its not negligible in my mind. The car will range over 300 miles on a normal size tank of regular fuel.
#253 of 311
Highway mileage by brent99
Jun 07, 2007 (7:08 am)
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If we leave our local area, we can get up to 25 MPG, probably netting somewhere between 22 and 25 for a mix of highway and local driving.
#254 of 311
Hiway mileage -400h by nigh
Jun 07, 2007 (2:25 pm)
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We just today had our 40000 mile service. We average 26.5 mpg. One has to learn to "feather" the gas pedal. I agree, for a car this size with this load, we are doing very well...
#255 of 311
perhaps it's too soon to say, but it's better than expected... by dorenescar
Jun 07, 2007 (8:18 pm)
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We only have close to 1k, but our current average of mainly city with some daily short highway is 28.5 mpg. We hope this continues. We actually got 29.9 for most of one tank. I find it very easy to 'glide' between stops - this car seems to fly with little to no gas. We have learned the trick another poster suggested, which truly works: get up to maximum speed quickly, then take your foot of the pedal - it gets the best out of your mileage, for sure!
#256 of 311
Moderate mpg here by lansdownemike
Jun 08, 2007 (7:49 am)
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At about 1600 miles I get 23 - 24 mpg in a suburban mix. I've tried a variety of techniques, but feathering the gas seems to keep the mileage up. Getting up to speed quickly feels so counterintuitive as the "instantaneous" mpg drops so much, but maybe I'll try that next.
#257 of 311
Re: Performance: RX400h vs. RX330 [richcbt] by maximafan
Jun 15, 2007 (7:02 am)
Reply

Replying to: richcbt (Nov 21, 2006 11:52 am)

rich, I felt the exact same way as you when comparing the driving characteristics of the 400h and the RX350. I have the RX350 and have driven the 400h as a loaner car. The RX350 does feel quicker off the line, but the 400h gets really zippy at higher speeds. A friend that I work with has a 2005 RX330 and I feel that the engine in her car is more quiet than my RX350. I'm also having issues with the annoying rattling coming from the hatch area
(this is the second occurence since August of last year).
 
As far as the side-view mirrors, I find that pushing the driver's side mirror further out to your left will make it easier to see the car
coming up in the lane beside you. It takes getting used to, but I believe it really helps.
This may involve pushing the mirror out more than you would expect to. Good Luck. I will be calling Lexus today regarding my rattle problem.
#258 of 311
400h gas mileage by maximafan
Jun 15, 2007 (7:05 am)
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Hi all! I am driving an '07 RX350. I've had it since August of last year. I drive almost always in the city, with mostly back and forth between my home and downtown, which is about five to six miles one way. I'm averaging between 17 and 18 mpg's. I was wondering if anyone could tell me what an 400h might average mpg-wise with the same kind of driving.

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