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.
And for a little sensitivity study...
Payback mileage as premium fuel cost changes:
$3.00 / gal : 210.0 miles per $1 spent modifying the gear ratio
$3.50 / gal : 180.0 miles per $1 spent modifying the gear ratio
$4.00 / gal : 157.5 miles per $1 spent modifying the gear ratio
$4.50 / gal : 140.0 miles per $1 spent modifying the gear ratio
$5.00 / gal : 126.6 miles per $1 spent modifying the gear ratio
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That's assuming you drive all highway and doesn't include installation. The payback period is probably 250k miles plus in reality. I applaud thinking outside the box but this is an asinine idea. Not only will it never pay back financially but you are voiding the drivetrain warranty on your brand new car. If you all you want is a quieter car take off the sound tube and add some sound insulation. It will save you $500+ and actually make your car noticeably quieter.