rfcbuf Posted November 17, 2019 Share Posted November 17, 2019 My 2019 owners manual calls for 91 octane gas that is TOP TIER rated. Neither of these (2) requirements are available in gasoline stations conveniently close to where I live. What do most owners use to keep the GX running as it should without gas containing the proper additives to keep the engine/valves deposits in check and eliminate engine knock? Quote Link to comment Share on other sites More sharing options...
JD460 Posted September 27, 2021 Share Posted September 27, 2021 Any 91 is fine. Top tier is sort of a scam according to most gas delivery truckers. They say they deliver it to all types of stations even though it may not be labeled as such. Quote Link to comment Share on other sites More sharing options...
RX400h Posted September 28, 2021 Share Posted September 28, 2021 I really like Shell premium. Their gas is used exclusively by Car & Driver magazine. Quote Link to comment Share on other sites More sharing options...
Bykfixer Posted September 29, 2021 Share Posted September 29, 2021 I lived near a tank farm in Greensboro NC for a time and each day Exxon, Shell, Texaco, Amoco, etc trucks all filled from the same gasoline tank day after day. I could not believe my eyes. It was like that time I found out santa clause was actually not real. It's when the truck places the fuel into the tank at the filling station where the so-called magic begins. The specific product is mixed in there. I do not know how it is done but there are brands of gasoline I get better fuel economy using. Not a lot but 15-20 miles extra a tank full. I prefer 93 octane in my car but if 91 is all there is so be it. Quote Link to comment Share on other sites More sharing options...
Warren Marshall Posted September 29, 2021 Share Posted September 29, 2021 The magic: From the refinery, gasoline and diesel fuels are transported to terminals. It is at these terminals that detergents and additives, are added, to formulate to produce high quality blends. I tested my mileage with the various octane's when I 1st purchased my ES350. The better the octane - the better the gas mileage. One thing I really noticed was the performance. What a difference between 93 octane vs 88 octane. (and the price difference) Quote Link to comment Share on other sites More sharing options...
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