Before you boys get too carried away by these numbers, you'll have to include average mph as a factor.
As an example: last year I ran east from Fort Worth two days in a row on IH20. Set speed was 68-mph for cruise control. Both days were within a few miles and a few minutes of each other. Not planned. Average speed each day was 54-mph. Engine was never run when stopped.
Traffic, construction, etc.
There's always a divergence.
Had I set my speed at 62-mph I doubt there'd have a difference in travel time from the above worth calculating.
Hypothetical is great. Work this and other factors in.
Note: average speed will be higher between midnight and noon than the reverse.
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