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Unless you are frequently cruising at or below 50 mph I would work on aero first.
For rolling resistance though...
Have toe set to 0 degrees will give the car a little tramlining at higher speeds but will reduce rolling resistance.
I'd say I gained a good 2%-5% mpg for speeds between 35 and 50 mph.
How much you gain is highly dependant on where it's set at now.
Of course make sure your tires are pumped up.
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Lifetime mpg
2012 mpg
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