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I used them on my Impala for a number of years.
Didn't seem to affect MPG. Never used them in winter (car not Ziebarted).
OK tires.
Not much ever affected the Impala's MPG until I swapped out the old second gen small block for a LS2.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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