better MPG

IMO, the T-Q is best for mileage, but a fine tuning may be difficult to do since parts are very hard to come by.

My best mileage adder was a Jacobs Pro Street ignition, you'll do just fine with a MSD set up. Open air filter and a K&N or equal will be good to do. Headers with a 2-1/4 inch pipe and a cross over. H or X with performance mufflers. If you need to have cats on the truck, dual cats near the collector of the header. Deleate A/c if possible, electric fan A better intake than stock, a Edel. Performer would do well.

etc.......