Quote:
Originally Posted by Buckru
Brian,
Can you give us your mileage numbers? From your posts, I assume you are running Sepreme gasoline with the highest octane rating.
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Actually this will probably surprise you all. I have not run a single tank of higher than 87 octane. So I've not tried this to see how it performs in my truck. This is just something new that I thought about recently. I'm still not sure that I would pay the extra money, but I might try at least one tank of it on a trip I'm taking next week.
Right now my mostly highway mileage is running about 11-12 with an occasional 13 average if I'm mostly highway and keep my speeds at around 60. If I mix a lot of city in there or dirt roads, it gets down to 10 or even close to single digits. That's with my mods and Oregon's now year round 10% ethanol gas and 87 octane.
One of the things I'm kind of curious about is to see if there's a huge difference with the ignition mapping using a higher octane fuel. The scangauge can allow us to see this. Unfortunately, the numbers jump all over the place, so it's really hard to see what things are doing, much less compare to other numbers. If someone had a scantool that could record and map out the ignition timing under the same conditions, but different octane, that might be interesting. The scangauge also seems to pump out fairly accurate mpg and brake h.p. figures, which would be interesting to see on a graph using the different fuels.
If I do run a tank of premium, I will defiantely be taking scangauge measurements with the 87 stuff and trying to compare under similiar conditions with the higher octane.