Quote:

my CTD gets 24 mpg @ 65 MPH with 2-5 pounds of boost



Don't bring a diesel into the conversation or everyone will get confused



Diesels do not have a throttle blade and therefore don't pull vacuum. Your CTD will also build boost going downhill with your foot off the accelerator. A gas engine will never do that. Diesels also have a very wide range of operable air to fuel ratios, running as lean as 50:1 at idle.

70 Sport Fury
68 Charger
69 Coronet
72 RR