87 Octane

[Y-Blockhead]

Originally Posted by 1929

I always use 87 octane in my regular car, and my Model A. Someone I know who owns more then a few old cars ,and Hot Rods, says I should only use in my Model A, High Octane, and add high octane booster due to the fact that there is Ethanol in are gas, and that my motor was newly rebuilt. Is that excessive?

Ethanol actually has a rather high octane rating. Chevron in the 30's actually added ethanol to gasoline to raise the octane level. Unfortunately ethanol doesn't have as high Energy Content (BTU's) as gasoline so you have to burn more.