If your mopar is you daily driver!

I'm putting an overdrive in my Dart , now it's getting 25 mpg highway , figure with an overdrive and a change in gears I'm hoping for better all around mileage . Don't drive much city , but the 3.23 are not great in the city ,3.55 or 3.73 and the overdrive should give me the best overall highway city mileage , at least I hope so .
Even with $6.00 plus gas I see plenty of pickups and other cars with bad gas mileage on the road , summer I see lots of trucks pulling speedboats , now there is a combo that eats gas .