TimZ Posted June 23, 2015 Share Posted June 23, 2015 Are folks really using Premium in their GX's? I note the owner's manual calls for 91+ octane, but hard to believe it wouldn't run fine with 89? Would be nice to save the difference..... Quote Link to comment Share on other sites More sharing options...
pj8708 Posted July 5, 2015 Share Posted July 5, 2015 Hi Tim and Welcome! Year after year, Lexus owners have discussed the whys and wherefores are the best fuel grades for their model Lexus. In addition, as updated models come out, Lexus has changed some engines to run on different octane blends. Around 2010 several engines were modified to accept 87 octane to 91 octane as well. In my 2010 ES350 it was designed to use 87 or 91 octane. Given this ongoing puzzle of fuel choices I recommend using what the Owners Manual recommends. This helps protect you from any problems that could come from a fuel choice and will give you the best engine performance. Paul 1 Quote Link to comment Share on other sites More sharing options...
13IS250C Posted July 7, 2015 Share Posted July 7, 2015 I agree with Paul. I have a premium vehicle. I'm going to use the proper fuel. Once when I was driving my Z28 as a daily driver, I got cheap and put regular in it. I hadn't gone 2 miles before it started sounding like someone was shuffling a deck of cards under the hood. I never got cheap on gas again. 1 Quote Link to comment Share on other sites More sharing options...
JiminOhio Posted April 18, 2017 Share Posted April 18, 2017 Save little now, pay big later Quote Link to comment Share on other sites More sharing options...
B-Rod Posted July 14, 2017 Share Posted July 14, 2017 I did the math over the course of two months. Using 93 octane from Shell or BP in the GX improves overall mileage enough to actually save 1.3 cents per mile in fuel cost. But even if it cost a little more per mile, my butt dyno says the engine runs noticeably better with hi-test. 1 Quote Link to comment Share on other sites More sharing options...
charles long Posted March 7, 2020 Share Posted March 7, 2020 Can I blend 89 oct and 93 oct on 2016 gx 460 Quote Link to comment Share on other sites More sharing options...
Walt32408 Posted August 28, 2020 Share Posted August 28, 2020 Yes, I fill up when the tank is half full. Every other time I put in 87 octane fuel and the other times I put in 93 octane fuel. Works great! Quote Link to comment Share on other sites More sharing options...
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