does it require premium gas
No you do not have to use Premium gas, you can use Mid-grade but never use Regular on a Luxury performance vehicle. You will get better performance and MPG's with premium gas.
having had two ES350's a 2007 and a 2012. Between the two cars i totaled 100,000 miles. I used regular gas in the car, got 31-32 miles to the gallon on highway trips (65+ mpg) and 24.7 avg on mixed driving. The car never pinged, started on first button push and made me happy every day. If it was AWD i would have a 3rd one. Always fast never hesitated and gave me a smile each day. I simply LOVED these cars. The knock sensor on the car always performed perfectly and the cars never so much had any engine or performance issues. As an engineer, frankly all the discussion is nonsense, the cars ran great. I bought regular fuel today for 1.49 gallon, Premium as 2.55 you have to be kidding if you think that is worth the extra money to make you feel a little bit better.
I can only say i bought a 2007 es350 out of the showroom and never put in regular, only premium as they reccomended and got 235500 before the torque converter went, im now in a 2012 and am a little confused as to what to use
I believe they said i should use regular but cant remember
Yes, regular 2011 and older is recommendation, but probably ok in older from research
it is just a six cylinder motor, the same as my acura had. I used regular all the time in it with no issues at all. 240K and still running like a charm. I just gave it to my son and bough a lexus ES and hope it treats me as well.
I just got a 2017 ES and they said it's designed to use regular. But people some recommend using 91 premium for better performance and engine life. So i'm confused to what I should use. I guess I go with what the dealer said. But I have many luxury cars and I never used regular 87 gas in them.
Older ES350 and some other Lexus used to recommend premium but the same engine in a Camry was using regular. This difference was the Lexus could advertise slightly better performance HP and torque figures then Camry. Lately Lexus has dropped to recommending regular and so did the performance specs. Now same as Camry, so I guess for Lexus the sigma of premium wasn't worth it.
Regular is fine. And, it's a fallacy that higher octane gas results in better fuel mileage. The only thing higher octane gas does compared to lower (regular gas) is prevent knocking (preignition)
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