timmus
A2OC Donor
Congrats
The 17s will be having an impact, but it's hard to say how much exactly. You can do better than the cruise control - let the speed drop slightly as you are going uphill, and let it increase (or freewheel) down the hill. The CC will be trying to hold the speed rigid, and that isn't optimal. Having said that, the mpg difference will be small.
Thanks Mike! Indeed, I could stop using cruise and do what you suggest regarding the hills, but I like getting around in comfort, and cruise is the ultimate comfort accessory as far as I'm concerned. I'm willing to pay a few MPGs for the luxury.