I now have straight BP 92 in my car from that place at Dale & Cty. B. Sweet. Now I can squeeze more energy through my pathetic tiny injectors. Its only a nickel more per gallon than the E10 premium. $2.29/$2.24 = 1.0223 14.7/14.13 = 1.0403 If you need 4% more E10 than straight gas to get stoich and it only costs 2.2% more, the straight gas is actually a better deal, eh?
You might need 4% more BY MASS, but you need to flow about 7% more BY VOLUME of e10 to achieve stioch.
So what is 14.7? The ratio by mass? I guess it would have to be since air density is always changing.