Originally Posted by
Hib Halverson
I know this is an old thread, but I encourage anyone who's tuning for E10 to actually test the fuel they use. A chemist at a racing gasoline blender told me a couple of years ago that most of the ethanol blended gasoline on the retail market is actually somewhere between 7 and 8% ethanol rather than 10%. I've also tested several samples of ethanol blended gasoline from premium gas pumps in my area and sure enough, they all were about 7-8%.
As a result I assume it's all E7 and set my stoic value at 14.2:1 = lambda 1.0.