Jamie,
I'm thinking of asking Santa for the 5-Star Tune, approaching $500 it's a bit much for just a .6mpg increase...but some of the other fixes (eliminating/delaying the 2 gear downshift going uphill, better engine speed control going downhill) sounds good.
Doc
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Sheree & Michael NCNG LTC(ret) with Munpi, RC and Sheba (cat).
2019 Nexus Viper 27V, E-450, 5 speed "Ms. Enterprise", Infotainment Center, HUD, , Safe-T-Plus, Curt SpareTire Mount, ext. WiFi Antenna, Roadmaster Tow Sys& Invisibrake.
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