yeah, we kinda explore the edges of the mpg world, dont we? mid-70s commuting, 6-10 on vacation. i need to make a bumper sticker for the insight: I'm saving gas...for my RV! and one for the rv: My other car gets 75mpg!
anyway, i too keep the coolant temp gauge up on the sg2. lets me know when i need to remove the radiator block. typically 75-78 OAT and i start gaining temp on the freeway overpasses. of course, the factory gauge never moves. i also keep the front battery voltage and TPS in view. the fourth one i vary a bit.
1999 Winnebago Minnie 29', Ford V10, Close to stock.