Well change of plans. Went and test drove the ATS. She doesn’t think she can make the switch to a car. So we found a 16 Yukon with a 5.3. Talked her out of another Denali as the trim packages are basically the same. The major difference being 6.2 L and The eight speed transmission. Literally no need for the 6.2 as anything we haul will use my truck. The 5.3 is pretty basic and proven motor. So my question is is there anything quick and easy I can do to improve the mileage a little. This has always been the biggest complaint about her Denali. Not so much the miles per gallon. More the size of the tank and how frequently she must stop and fill it up. She’s pretty sure her time is the most valuable on the planet and it’s an annoyance to her to have to stop and fill her tank LOL