Does the lexus RX 450h require premium unleaded? I have an ES-350 now and use regular

Asked by Nov 24, 2013 at 11:29 AM about the 2010 Lexus RX 450h FWD

Question type: Maintenance & Repair

7 Answers

122,525 style=101162469 -- this states premium required.

3 people found this helpful.

My lexus rx400h does not require premium. If you use regular you might get 1/2 to a mile per gallon less . You would not notice any difference in performance or hurt your engine.I heard that you can have your timing retard, but I am not sure that it makes any difference. Did you notice that the gas stations have quietly conspired and raised the price of premium by 40 cents a gallon? I did not in the begining.. They always challenge your intelligence and observation capacity.

1 people found this helpful.

The owners manual for the 2016 RX450h states premium gas should be use. The manual for the 2016 RX350 states regular gas should be used. Both models have the same engine. I've been driving my 2016 RX450h for nearly a year, using regular gas. It runs great! I've experienced no problems at all with performance or gas mileage. I see no reason to pay 40 cents a gallon more for premium gas.

6 people found this helpful.

The engines for the RX350 and the RX450h are similar but not the same, as the 450h engine runs a modified "Atkinson" cycle. Lexus literature recommends premium for the 450h, but I wouldn't be surprised if it ran reasonably well on lower octane fuel, given that most engines will adjust timing automatically to avoid pinging. We've recently purchased our first tank of fuel for our 450h, and spent the extra 20c/g to follow the manufacturer's recommendation; as I recall the owner's manual states it as a recommendation rather than a requirement. With all the automation in the car, the engine computer can probably record information that would tell a dealer what fuel is being used, what a dealer might do with that information is not knowable.


I have owned 3 Lexus hybrids over the past 10 years - one 400h and two 450h. I have driven each of them over 50k miles using regular unleaded with zero problems.

5 people found this helpful.

Can u tell me how much it effected the gas milage off the 30 mpg estimated...


The 30 mpg rating is determined with the vehicle running on a treadmill type device, on a level surface, indoors (with no wind interference). You will get nowhere near 30 mpg driving in real-life conditions. I live in a very hilly area. I ran 2 tanks of premium gas in my 2016 RX450h, in both economy and standard modes; the best gas mileage I got was 24 mpg. That rating was the same when using regular unleaded fuel.

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