An 84 Crew Cab dually is not going to get good mpg, especially with a 440. I can understand the desire to get all you can. I hope it has the 3.54 gears instead of the 4.10 set.
*Sigh* - I have the 4.10's...
Wile E. Coyote Super Genius, Lover of FCA US LLC Products ************* 68 Road Runner (440 4-spd), 71 Superbee (383 slap), 71 Charger 500 (383 4-spd wA/C 1of 182), 72 Imperial, 74 Charger SE (440 sunroof), 84 D350 Crew-cab Dually (440), 75 D300 Dually Tandem (318 4-speed)
