name redacted wrote:Chevrolet's Sprint was a 3 cylinder normally aspirated econobox that routinely saw 35 mpg. And that was 80's technology.
Premium fuel is blended with ethanol (among other things) to achieve higher octane. Premium fuel with ethanol has less energy than unblended fuel. So the net result from fuel blended with ethanol is less MPG. Premium fuel does not give a noticeable increase in mileage despite what anyone thinks or says.
Every oil company uses different ratios of various chemicals to make their premium grade fuel. You will actually get different mileage results between manufacturers, than between one manufacturers regular/premium blends.
I got the best performance out of my spec miata racecar with Sunoco 87 octane pump swill, but my 409 big block Impala needs a minimum of 100 octane fuel. VP-C12 was ideal because it came in 100/110 octane, and had lead. But lead is no longer available in any fuel, race or otherwise, in the US.
When I raced GP motorcycles, it was basically an open class. Which meant that other than displacement, pretty much anything was allowed. So I experimented with many fuels. Some cost upward of $20 a gallon, and this was in 2003. VP-C12 was the best fuel for the dollar, at about $6.50/gallon. We would also blend some proplyene oxide to further increase its potential, but not being a chemist, I was reluctant to really fuck around with it. Plus it was $60 a gallon.
I had a supercharged Suzuki GSX-R with a roots type blower, that was run at a1:1 ratio. An NHRA guy I knew had some nitro benzyne he ran in his drag car. I added some to my fuel, and jesus christ, the difference was amazing. But god that shit is toxic as hell...
name redacted wrote: Lead is no longer available in any fuel, race or otherwise, in the US.
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