Date: Wed, 04 Apr 2007 20:00:48 GMT From: - Bob - <uctraingnospamanet.com> Subject: Re: Octane ratings.....what's the truth?
On Wed, 4 Apr 2007 17:31:15 +0100, "DervMan" <thedervmannospaml.com> wrote: > >As Fred says, who cares? Suck it and see. But, if your handbook says 91 >RON and you try 87 RON, you _may_ invalidate any warranty, but I don't know >of a modern-ish donk that could damage itself like this, merely run like a >three legged cat (i.e. lumpy and not as good as it should). :-) Here's more of the same... "Retune" is total BS. It doesn't retune and start running as well on regular. It *de-tunes* and reduces power so that it can run on regular. Big difference. Higher octane gas is not a fraud - certain engines will not run as rated with lower octane. Scientific fact for the SF guru who knows all. Some claim that 89 octane is oil company BS since cars are only rated at 87 or 91. But, 89 might be a choice for people like you who want to go a little lower and see how it works for them. Using higher octane *will* let your turbo run with more efficiently and with more power. Whether your particular style of driving, in your particular terrain, with your right foot will gain or lose MPG is dependent on all that. If you work out the minor % difference in price vs. the sometimes large 2-3pg change in mpg, using lower octane gas is usually a money loser. But, conditions vary. Try it, see how you do.