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Lexus GS 450h

298 messages,  Last post on Aug 02, 2008 at 6:17 AM

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What is this discussion about? Lexus GS 450h, Hybrid Cars, Sedan

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#297 of 298 How much does octane matter? by bmwconvert May 20, 2008 (9:13 am)
In light of $4+ gas and the $0.35/gallon extra for premium fuel, I've given the other fuel grades a try and haven't noticed a bit of difference in my 450h. I forget what the car calls for -- 91 octane maybe? I've always filled up with premium, which in my area is 93 octane. Plus/middle grade is 89 and regular is 87, presumably everywhere. I tried a couple of tanks of plus -- no difference. My last fill up (I always run the car down near empty) was regular, and again, no difference.   Am I hurting the engine in any way, short-term or long-term? I believe I've read in the past that lower octane may give poorer performance and may impact fuel economy, but I haven't seen it. I'm certainly not going to risk damaging my engine to say $4-$5 per tank, but I haven't seen anything to say that this will occur. Replies to this message: hulhubber (Aug 02, 2008 6:17 am)
#298 of 298 Re: How much does octane matter? [bmwconvert] by hulhubber Aug 02, 2008 (6:17 am)
Replying to: bmwconvert (May 20, 2008 9:13 am) I have been using regular in my '07 for about a year with no preceivable differences. At the first few tanks, there was a bit of hesitation when the engine started up, but after a week or so that dissapears and performance is quite acceptable.

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