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Re: 1969 gmc 4x4 1500 deluxe
Yes. If you don't know if you have the original gears, check rpm vs speed with a GPS unit. What you are reading on speedo is not relevant. 3500 at 55 doesn't provide enough info to know where to start. Tuning the motor, yes, could provide 1 or 2 mpg improvement, but not much more. Btw, what IS your current fuel mileage, specifically?
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