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Even at $200, that's 50g fuel, so if I get 3% better fuel economy than my current 53mpg, that's brings me up to 54.5mpg.
53mpg * 50 = 2650
54.5 *50 = 2725, an extra 75 miles per tank.
75/50=1.5 gallons saved per tank based on previous mpg
50*1.5=33.3e tanks before I start saving from the mod's benefits.
This is with fuel at $4/gal. It's $4.25 or higher for me, so payback time is less.
Realistically, most p people only use 75% tank capacity between fills. Scale the figures accordingly.
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