Huge laughter from Utah!
On my two trips, reminding everyone, speed limit most of the way was 80 mph (was doing 83-90), I was pulling down 2.42 to 2.65. Speed is the single most factor IMHO for efficiency. From the bay area (Alamo, CA) to Lake Tahoe/Reno area, I noted 2.72 - but, I did encounter...