Mileage per gallon after regear?

[wanderer]

I am about to regear to 488 I am running 37s. Right now I get 12.5 mpg maybe up to 13.5 mpg
When you. Guys regeared to 488 with 37s. Did your mpg go up or down? How much ?

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[RangerG]

I am about to regear to 488 I am running 37s. Right now I get 12.5 mpg maybe up to 13.5 mpg
When you. Guys regeared to 488 with 37s. Did your mpg go up or down? How much ?

15-17straight freeway. around town 12-13