JimJa
Well-Known Member
Because fines are so high for not meeting CAFE standards, manufacturers spend a great deal of time with their vehicles in the wind tunnel trying to make vehicles as aero as possible. My experience, as well as several near by friends with other makes, seem to bear out that around 65MPH seems to be the sweet spot. After that mileage drops off and more so the faster you drive, particularly above 75.
I make many 135 mile one-way trips between my home in WY to Idaho Falls, ID. That trip is not too hilly and the speed limit for 2/3s of the distance is 55MPH, the remainder is 65. Three days ago I made the trip and averaged 23.5MPG, round trip, driving 58 in the 55 and 68 in the 65 on 88 octane. Two weeks ago I made a 2,000 mile round trip to the mid-west and averaged 19.5, driving 73 on the 70MPH limit and 82 on the 80MPH limit (WY/S.D. Interstates) on 87 Octane.
Manufactures have to build within tolerances and once-in-awhile those tolerances come together on the bad side and sometimes on the good side. So consistent 22-24MPH in a RR is possible. I'm a light foot and wish I could get what to OP got. It is what it is.
I make many 135 mile one-way trips between my home in WY to Idaho Falls, ID. That trip is not too hilly and the speed limit for 2/3s of the distance is 55MPH, the remainder is 65. Three days ago I made the trip and averaged 23.5MPG, round trip, driving 58 in the 55 and 68 in the 65 on 88 octane. Two weeks ago I made a 2,000 mile round trip to the mid-west and averaged 19.5, driving 73 on the 70MPH limit and 82 on the 80MPH limit (WY/S.D. Interstates) on 87 Octane.
Manufactures have to build within tolerances and once-in-awhile those tolerances come together on the bad side and sometimes on the good side. So consistent 22-24MPH in a RR is possible. I'm a light foot and wish I could get what to OP got. It is what it is.
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