Freds430

Fuelly reports 18 2021 Lexus RX 450H with an average miles per gallon of 28.6. I have a 2017 with 91,000 mi and I've averaged 28 miles per gallon over the that lifetime. Your mpg is definitely low. Check your air pressure. You should be running cold 34 PSI at least. What tires do you have that can make a difference?

GS4_Fiend

iTrader: (22)

The mpg really depends on the traffic, temperature, distance, warm up times and etc.

In my area, driving mostly highway, I get 25 mpg on my non-hybrid.

TechNut

I’m at 28 right now with my 2021 450h, but that is according to the dash which typically reads about 1 mpg too high in comparison to hand calculated. During the warmer months, it isn’t unusual to get 30 or 31 with mostly city driving. As this is your first Lexus, may I ask if it’s also your first hybrid? Driving style, weather, average trip length and vehicle conditions such as tire air pressure can all affect the mileage. Aside from these considerations, it sounds like there is something wrong. I have never registered a tank as low as 24 mpg, even during cold winter driving combined with a series of short trips.

jollick

2020 RX450h fill up at 15,526 miles 3/13/24. Traveled 393.4 miles, 100% city short trips mostly 7 miles each way, weather mostly 45F to 70F.
29.7 mpg calculated. The RX said 29.9 mpg. Filled up with Sam's Club Premium 93 Octane.

Vlad6525

Computer showed 27.5mpg at the time of the fill-up. 353.6 miles travelled on 12.758 gallons = 27.66mpg
Trips are mixed roughly 60% on FM roads, 30% city streets and 10% highways. Temps from low 40s to high 70s.

Kulharin

Had a 2nd gen hybrid, 3rd gen hybrid and now a 4th gen hybrid. Mileage seems to have gotten worse with each generation based off what the dash board is telling me. If this is accurate that's a bit disappointed; I expect each generation mileage would improve but seems to be the opposite.

GSFRX350

I think have have gotten fatter, the extra weight makes a lot of difference.

Vlad6525

Computer showed 28.0mpg at the time of the fill-up. 335.6 miles travelled on 12.021 gallons = 27.92mpg
Trips are mixed roughly 60% on FM roads, 20% city streets and 20% highways. Temps from low 50s to low 80s.

Kulharin

Heh, I was wrong, mileage is better than 3rd n 2nd. The meter was showing km per leader rather than litres per 100km. Average is 1.5 better than my 2010

clipperskipper

Recently acquired 2022 just off lease with 23,000 miles

450h 31.4 mpg since purchase. Loaded with options, this is a really nice car.

Vlad6525

Computer showed 28.8mpg at the time of the fill-up. 351.9 miles travelled on 12.483 gallons = 28.19mpg
Trips are mixed roughly 50% on FM roads, 20% city streets and 30% highways. Temps from low 60s to upper 80s.

jollick

2020 RX450h fill up at 15,970 miles 4/28/24. Traveled 444.1 miles, 100% city short trips mostly 7 miles each way, weather mostly 60F to 80F.
31.4 mpg calculated. The RX said 30.8 mpg. Filled up with Sam's Club Premium 93 Octane.

jollick

2020 RX450h fill up at 16,374 miles 5/30/24. Traveled 404.2 miles, 100% city short trips mostly 7 miles each way, weather mostly 70F to 85F.
30.4 mpg calculated. The RX said 30.6 mpg. Filled up with Sam's Club Premium 93 Octane.

TechNut

Interesting. That is precisely what my last tank measured, right down to the tenths - even the dash reading. Our driving history with this tank was very similar with short trips, but temps were probably about ten degrees lower on average. Dash is reading 35.0 on the current tank at about 1/2, but average trip lengths are more like 15 miles. Still city/rural mix with 35 MPH average speed.

Vlad6525

Filled up 13.019 gallons after driving 382.9 miles. Computer showed 28.9mpg at that time, but the actual calculation came up to 29.4mpg...