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Re: As noted, but the $ difference is still minimal Posted by TML [Email]  (#2212)  [Profile/Gallery]
(more from TML) on Wed, 8 Jul 2009 20:54:35
In Reply to: As noted, but the $ difference is still minimal, newwithasaab, Wed, 8 Jul 2009 08:13:10 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Why would it knock in highway driving? It's under almost no load (unless you are driving 100mph+).
Your theory of using more fuel because you step on the gas more is interesting, but not actually based on science. Driving the same speeds with the lower octane gas will give better fuel economy because it has higher energy per volume. If you try to "step on it" to compensate for their being less power, the power just isn't there; the ECU does not just continue to dump more and more fuel in a vain attempt to propel the car faster. On the contrary, the effect you ascribe to the lower octane fuel does occur with the higher octane fuel. With the higher octane gas, the extra power potential IS there... so when you ask for more power, it does indeed provide more fuel to get that power.
Higher octane gives you more power (acceleration) potential, lower octane gives better fuel economy (provided it's within the range of the ECU to adapt to, and given the fact that thousands of people out there have been filling up these cars exclusively with 87 gas for many years and there aren't any reports of large amounts of them with damaged engines, I would say 87 is fine). I've used regular gas in my stage 4 9000 Aero (300+HP) about 90% of the time for over 5 years, and never had a problem. It also sees regular time at the track. I use high octane fuel for track use, but my point is it's driven hard, so if it was suffering continual damage it would be evident.
posted by 204.191.226...
, Wed, 8 Jul 2009 18:16:27, Wed, 8 Jul 2009 20:54:35 <-- Viewing This Message
, Thu, 9 Jul 2009 08:51:22, Thu, 9 Jul 2009 11:16:30
, Thu, 9 Jul 2009 13:35:37, Thu, 9 Jul 2009 14:24:21, Fri, 10 Jul 2009 08:44:24, Tue, 7 Jul 2009 19:48:09
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