Quote:
Originally Posted by Mitch
Base mpg: 30.0 mile / gal
New diff: 5% improvement
New mpg: 31.5 mile / gal
Premium fuel cost: $4.00 / gal
Base gas cost: $0.133 / mile
New gas cost: $0.127 / mile
Savings: $0.00635 / mile
Payback mileage (miles to break even, every mile after is actual savings): 157.5 miles per $1 spent modifying the gear ratio.
In other words, if you spend the $1106 mentioned earlier, it would take 174,195 miles before you broke even on the cost of the differential.
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Yes, which is why the cost needs to be taken into account obviously. If it weren't so expensive to get custom gearsets made then a 6th gear swap that drops revs say 15-20% rather than just 10 would make a lot more sense.