Well my 98 4runner is 2.5'' daystar lift for front and 3.5'' for the rear and stock 4:10 gear and is suck going up hill only can go 65-70mph. I actually going 70-75-80mph on flat road and still got ok mpg and at 71mph my RPM is 2300RPM. and this week i try to get 17mpg in city driving only, just driving like grandmom. Still think about regear for 4:88 or just get ARB F/R locker and done with it and still on stock gear.