I think Ford's reasoning for the new 7.3 goes a lot deeper than a bunch of guys arguing about diesel versus gas. Ford wanted to continue to offer a gas engine that could really handle a commercial duty cycle and they are discontinuing the Triton V10. The E series does not have a diesel option, and the 6.2 just doesn't have the "beans" of the V10 (despite more HP) as evidenced by a considerably lower GCWR, and was not offered at all in the F650/750 or class A motorhomes. The 7.3 gas fills that role with better power specs in a more compact package than the V10- any fuel economy advantage remains to be seen. The diesel guys will still buy a diesel.