Quote:
Originally Posted by pjbizjak  Has anyone taken a long trip via a Turnpike or Interstate in their V8 STS 5/6spd and recorded MPG at different speeds using cruise control? Say 50 miles @ 55MPH, then another 50 miles @ 60MPH and so on? Ignoring weather and head/tail winds sometimes going 60 gets better milage than going 55 based on the cars curb weight and rolling resistance(tires play a big part here), just curious! |
I am geek enough to have done this. I used a 2-3 mile flat stretch of interstate along my daily commute, using cruise control and the car-computer's average MPG reading.
55 mph 25.4 mpg on 4 runs
60 mph 24.0 mpg on 6 runs
65 mph 24.2 mpg 5 runs
70 mph 21.5 mpg 5 runs
75 mph 19.2 mpg 3 runs
This is on a 5-speed AWD V8.