Quote:
Originally Posted by Xseries
Using super unleaded is the best way currently to avoid too much ethanol. I have not done enough miles in my Bristol to establish consistent mpg, but in two other cars I found I obtained about 5% more mpg with the super unleaded which completely offset the higher cost of purchasing it.
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You’re not really going to see more power or economy on something with a carb unless you’re advancing the timing to take advantage of the octane.