Just wanted to report back on how my car did efficiency-wise on my recent road trip. AGT, 19" Aero wheels. Just me and about 350lbs of baggage, food, bevs, gear, etc. Also had a car refrigerator plugged into the 12V outlet whenever the car was running. Widely ranging weather and road conditions. And I have a real bad case of Lead Foot. All things considered, I'm actually pretty OK with this outcome. It's better than what I saw with my M3P on a similar trip two years ago.