Mpg 318

inkjunkie said

Speedo accurate? I always use a GPS when checking mileage. Thin radial tires inflated to the max, synthetics everywhere?

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good point. How accurate is your speedo.


Go on the highway and get up to 60 mph on your speedo. Now hold it steady at 60 and time how many seconds it takes to go from one mile marker to the next. If it is not exactly 60 seconds, then you need to correct for the spedometer inaccuracy.