GknowFotos

I bought a 13' with 93k miles that was religiously serviced at Lexus every 5k miles, and I'm barely getting 23mpg. I've only seen 27 mpg on a 400 mile trip from the Bay Area back down to Southern California the day I bought it, and that was it. To be fair, the AC is always on and I put 20" wheels and wider tires, although the wheels are lighter than the OEMs.

Planning on doing plugs, air filter, clean MAF and throttle body, and fresh coolant at 100k and hope it helps. I also need to check my battery.

roccitman

Just recently got a 2010 and our first two tanks of fuel are averaging out to ~35mpg. We're pretty stoked.
-r

GknowFotos

Did you mean kilometers?? Never heard of anyone getting that high of mileage in these.

roccitman

Well, we need more data right? Gimme a few more tanks and we'll get an average. Could easily be off, but hopefully not

roccitman

Thought of another thing. We live on Kauai and the fastest speed is 50MPH. We rarely go even that fast.

PortAh

A question, does the trip computer log past history of MPG, like 3-6 months or so?

Thanks.

roccitman

Hmm, not that I know of. Maybe in the later years (ours is a 2010)?

BartWindru

*Clear* (not just update) the fuel consumption records in the menu structure. Your average may be being dragged down by a long history from the previous owner.

JohnD333

Pretty old thread. Pretty but not very old 450H- 2015 luxury with 44,000 miles. Only one long multi-day highway trip. Average mpg since new 27.5. Average speed since new 28 mph. Hand calc mileage difference is in the noise + and-.

Do notice better performance and slightly better mileage with top tier premium than top tier regular. 85% of tile I use premium. Mid grade when cost differential is outrageous, which it often is. Differential between regular and premium is always at least 25%, often 33% or more completely offsetting any mpg savings versus gas equivalent RX. Given that it takes a lot more energy to manufacture premium, it probably is not really a good ecological solution based on fuel. However the 450 excels in comfort, power, and things like brakes and tuneup parts.

I would have replaced with a 22 450H if I could find a luxury that was not black inside/outside or uncomfortable F-Sport seats (or all 3!). Opted for regular gas 350RX. In 10,000 miles average speed is 27, mpg is 22. Again minimal difference between hand calc and info center reading and same driving conditions and habits on mostly flat land.

On GasBudy I see spreads between regular and premium continuing to grow, and stations having much larger station to station spreads for their premium versus station to station spreads for regular. And if you do not pay attention, cheap regular often means rip off on premium.

I did not and would not wait and jump on a 23RX 450 because it will be a first model year for the power train and some other features. Hopefully the 4-cylinder turbo engine will carry the weight flawlessly and won’t suggest or require premium. Only time will tell.

BillUK

I think it's hard to get 30 mpg at 75 mph. Best I can get on my 3rd Gen is just over 40 mpg (UK gallons), so 30 mpg US. That's maintaining a speed of 60-65 mph though. It drops noticably if I go above 70.

Alex2010

I have a 2010 Lexus rx 450H for one week now and I want to share my experience. The car has 128.000 miles and is front wheel drive. In the city if I am accelerating slowly I am getting 30, 32 MPG. As long as I keep the speed bellow 60, my mpg has a average of 30. But on highway the mpg is horrible unfortunately. At 70 miles per hour I get a 24 mpg and at 75 I get under 20mpg. Now I am more excited about driving in town, which I never believed will be possible. From what I read on this forum this is a normal gas consumption but my question is: there is no possibility to not have that brake once I am taking my foot off the acceleration?

703

that doesn’t sound normal. I get the same mpg or better in the highway.

roccitman

OK after 4 months we're averaging 29.4.
That's what the display says anyway. We do a lot of slow driving here on Kauai, could be a factor.
¯\_(ツ)_/¯

gadgetman1

What kind of tires are you running & are you keeping them at the psi stated inside the drivers door? Have you had any brake work done? That’s really low mpg!

jhughes556

Lookup a technique called Hypermiling. https://www.carbibles.com/hypermiling/ It's a technique to increase mileage on ANY car. I tried it on my early model Insight and Prius vehicles and it increased the mileage in some cases, 20%. Beware though, it might cause single finger salutes from other drivers.