The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 3/26 M Car Covers (by State of Nine) | 12/12 Make Amazon Pay Saabnet!
Date: Sun, 14 May 2006 14:11:50 -0400
From: Fred W <Malt_Houndnospamm-me-not*yahoo.com>
Subject: Re: Regular gas in a 9.5?


Bob wrote: > But the bottom line going back to the earlier post that some folks are > missing the point of. You can use lower octane gas but you will get > less power per gallon/liter and you will need to push on the pedal > more for the same output. More gas per mile, less mpg. Not necesarily. The energy contained in the fuel is the same. If the engine computer (ECU) retards the timing it is because the fuel is burning too fast (pinging) and the combustion is happening before TDC. If the ECU does a correct job of backing off the timing is could have no effect on mileage. Taken to the other extreme, if the engine was set-up to run low octane (fast burning) fuel and you fed it very high octane (slow burning) fuel it is possible to have incomplete combustion and be exhausting unburnt fuel. Obviously that would nbe counterproductive to fuel economy. > > As gas prices rise (at least in the USA) the actual per gallon > difference between 87, 89, and 93 octane seems to remain the same. > That means that on a percentage basis, the cost of using premium is on > a steady decline. Since the percentage difference in mileage is not > changing, the cost and advantage of using higher octane gas is > increasing. Whether or not it makes sense to use premium for your > driving style and conditions is something you need to test over > multiple tank fills. I agree with all of the above except the assumption of *better* fuel economy when running higher octane. The try both and see is the best approach. -- -Fred W

Return to Main Index
StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]