Actually, it's closer to about 6-6.5mpg. Lol Know much about true engine dynamics? Running 100% 110 octane is indeed just a touch too much for my particular application but when I built my engine and blueprinted it the specs of the engine dictate that I run somewhere around 100-104 octane to be on the safe side of things. High octane fuel and non ethanol fuel in my parts isn't readily available in my neck of the woods but there happens to be a station that sells Sunoco Standard 110 at the pump so I cut it with about 3-5 gallons of 93 octane. I was going to get into a long drawn out post about engine specs and building it correctly but to keep it short- on the street a big block with cast iron heads that has a dynamic (not static) compression ratio right at 9:1 absolutely will NOT live on pump gas unless you detune it, pull a butt ton of timing out of it, drive it gingerly and keep it cool. It would be like pulling the pin on the grenade and throwing it down the intake hoping the handle on it doesn't let go every time I take it to 6,000rpm. So for my particular setup, high octane is a must and when we're talking what it cost to build, paying for the right fuel isn't only cheap insurance it's the only way to go my friend.. especially when it gets wound up every single time I drive it! Lol
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