I am about to buy a 2002 6 speed drw with 4:10's for the time being. Not sure what kind of mileage you get with 4:10 doing 70 or so but it can't be very good. Is it worth the trouble to swap gears or would you think going to 315 tires would be a better option?

 

I have a DRW with 3.55's and get about 20 at that speed. Dad has one just like it with 4.10's and he gets around 15-16.