Quote:
Originally Posted by JRMichler
Or put in a vacuum gauge and practice DWL. If you run consistently at 12 to 15 In Hg vacuum or higher, a taller final drive ratio will help. If you are consistently less than 8 to 10 In Hg vacuum, your existing final drive ratio is good.
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This seems like the best practical test I have seenposted for determining ahead of time what a gearing change would give you. I remember on an old 83 honda civic I had once with the 1200cc motor I cnanged the 12" wheels for 13s with fatter and taller tires and the fe dropped several mpg. If I had known the vacuum guage trick I could have saved a ton of money and trouble.
