I have. I ran the stock towing tune until I got my 87 Custom Performance. I have run the 87 Performance for about 8 weeks. I'm just playing around with it. Initially it looked like I was getting better MPG. but it was because my wheel size got whacked when I switched tunes. I've just about got that dialed in so I can make a good comparison. I must remember to WRITE IT DOWN this time. It seems that the tranny only tune is doing a hair better on gas, but I can't tell until I get the tire size right. I guess then I could do a tank on each (all three) and compare. Is there a "normal range" on the spark advance?
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Thu, September 13th, 2012, 09:39 PM
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