Both had 1/2 tank of gas, all fluids, same weight on 2 different certified scales. The Challenger is a 727 auto and the Duster a 4-speed. I know that heavily optioned big block/Hemi E-bodies can be porkers, especially convertibles. The '73 Dusters do have a bunch of bumper, lol. And they have some door and roof reinforcements the earlier Dusters don't have.
