Speedster,

What language do they speak where you are from - you know, Martinsville, Indiana?

Your sig obviously hasn't been updated. Not looking at the financial side of the decision, if it runs on 5% or whatever, great. I'd stand with my original thought that it's still the carb's tuning, not the fuel that's going through it. He can get it squared away and the only thing it will cost him is his time.