ReagansRollsRoyce
01-06-05, 08:51 PM
Somewhat related to the 21 mpg post below but different enough so I decided to start a new thread.
In my 87, i get anywhere from 18.5-21.5 mpg on the highway.
2 questions
1.) (might be kind of a toughie) if you are in cruise control, what speed do you think provides the best fuel economy? 55, 65, 75?
2.) if the highway on which you drive has some hills, but not big ones, is it more efficient to go in cruise control despite the occasional downshifts to 3rd on steep grades or better to stay in overdrive and slow down 5-10 mph on the grades without downshifting...in short...is steady speed or steady throttle better on gas?
This is more curiosity than anything else, I know I won't get incredible mileage driving a big Cadillac! :)
In my 87, i get anywhere from 18.5-21.5 mpg on the highway.
2 questions
1.) (might be kind of a toughie) if you are in cruise control, what speed do you think provides the best fuel economy? 55, 65, 75?
2.) if the highway on which you drive has some hills, but not big ones, is it more efficient to go in cruise control despite the occasional downshifts to 3rd on steep grades or better to stay in overdrive and slow down 5-10 mph on the grades without downshifting...in short...is steady speed or steady throttle better on gas?
This is more curiosity than anything else, I know I won't get incredible mileage driving a big Cadillac! :)