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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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#247 of 311 Premium by kaperino Apr 10, 2007 (12:59 pm)
Bought my 2006 in 2005. Have 35,000 miles. Specs recommended 91 or higher. I used the higher grade ( premium) for a year and switched to middle grade. Just a mile or so difference per gallon. Master button? Not sure of the question. I know of no other display of MPG other than on the trip information screen
#248 of 311 Re: More Mileage Info [rockville1] by holew May 19, 2007 (7:27 pm)
Replying to: rockville1 (Mar 14, 2007 9:26 am) By Mid-Range gas I am thinking that you mean 89 octane. If this is correct you would be better off mixing 1/3 87 octane with 2/3 93 octane which results in a 91 octane mix. You will find that this is cheaper then buying 89 octane gas.   I have a 2002 LS430. The owners manual indicates that 91 octane is appropriate. Of course 91 Octane fuel in not available at the pump, at least where I buy fuel here in the Mid-Atlantic. So at every fillup I merely compute the number of gallons needed, divide this by 3 and pump the 87 first and then top it off with 93. While this might sound strange for the owner of a $60k car to do this to save a dollar or two at a fillup, I ask you this. If you saw a dollar one the street would you pick it up? If so this is how I find a dollar in the street at least once or more a week. There is usually a 20 cent difference in 87 and 93 gas. So pumping 5 to 7 gallons of 87 at 20 cent less per gallon equals $1 to $1.40 per tank full.   I think if you read the owners manual for you Lexus RX400h you will find out that 91 octane fuel is recommended.
#249 of 311 Re: More Mileage Info [rockville1] by apg97ss May 20, 2007 (5:23 pm)
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. Replies to this message: kaperino (May 21, 2007 3:10 am) 150mphclub (Jun 05, 2007 4:43 pm)
#250 of 311 Re: More Mileage Info [apg97ss] by kaperino May 21, 2007 (3:10 am)
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. Replies to this message: 150mphclub (Jun 05, 2007 4:43 pm)
#251 of 311 Re: More Mileage Info [kaperino] by 150mphclub Jun 05, 2007 (4:43 pm)
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)
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)
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)
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)
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)
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.

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