First off on the tunes.
The economy-daily driver can be combined with both those tunes you want. Like Jack said.
Put all your info on the order form. Like elevations you drive. Tire size. Comuter. Gears. Areas you drive. Hilly, flat. That's just some to give you some ideas.
Request max tow for the truck on the order form also for the 89 tow tune.
I personally would keep the canned perf tune(level3).
MPG's gains all depend on how "you" drive.
Good luck!
Be safe!
Lars
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