Does anyone have this kind of setup? I know the 410s can hand 31s but im getting decent gas mileage right nowon stock tires. I want to know how much it'll change before actually going through with it

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2005 XL 2.3 (duratec), 15x8 American Racing Baja wheels, BFGoodrich 32x11.50 all terrains, 4.10 open diffs, CB/PA, ORI Baja Eliminator Lightbar(sold), Hella 500 Foglights, Fabtech upper control arms, camburg coil springs, Maxtrac "4" inch spindles and shackles, 32 inch Bfgoodrich AT's, Spyder Halo Headlights, custom rear tube bumper with integrated hitch, custom front prerunner bumper with skidplate, roadrunner fiberglass front fenders, pulled bedsides

Probably lose 2-3mpg

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2017 Lightning Blue Mustang GT PP 430/402
CJ Pony Parts Lowering Springs | Texas Speed Longtubes | PMAS CAI | Lund Tuned | Borla S-Type Catback
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good question, I have a 2.3 with 4.10's and it reves high as all hell on the highway, cruising at like 65-70 is just under 4000 rpm in overdrive!

If you put larger wheels on it it will bring down the RPMS and actually increase mpg on the highway, But city driving will see a slight decrease in MPG because of the extra power it takes to move them from a stop.

What size tires are you running? I have a 2.3 Lima auto with 4.10 and 31. City I get around 14mpg I get 200 miles out of a tank. On the highway I do 70 at 2500rpm. And 80 at 3000rpm. I got 16-17 mpg with my 3.73 but the truck was a snail. The 4.10 did help a little. But I also have a lead foot. And I need to do a tune up and new o2 sensors so that doesn't help my mpg. You have a duratec from what your sig says, so you'll be good.

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1997 B2300 reg cab 2.3 Lima, 15x8.5 Mickey Thompson classic 2, 31x10.50 cooper discover at3, 7.5 open 4.10 rear, dynomax super turbo catback, alpine iva-w200 w/ nav, kicker 6x8s, alpine type R 8, alpine 250W mono amp, power bass 400.4, tool box & camper shell, compustar alarm/remote start.
1956 Ford F100 rust bucket with big plans!