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Originally Posted by Mustangwill
I usually take the interstate, put the mph at 75, and put on the cruise control. There are some hills and my cruise control speeds up/slows down to compensate.
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First slow down.
Tip #40
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40) Reduce speed
Aerodynamic drag increases exponentially with speed, so reduce highway cruising speed as much as practical and safe.
Generally, a vehicle's most efficient speed is just after its highest gear has engaged.
See the Ecomodder Blog for more information on tracking fuel consumption.
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Tips # 42 and 43
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42) Cruise control - when to use it
Set the cruise control if you're the type of driver whose speed creeps up higher and higher the longer you're on the road, or if you have difficulty holding a steady speed (it wanders up and down).
But realize that cruise control is just a band aid for those behaviours. Generally it's less efficient than constant throttle driving, and much less efficient than "driving with load" / "target driving".
43) Cruise control - when not to use it
Only use cruise control on flat roads. On hilly roads, cruise responds to changes in grade - by feeding in more throttle on the uphill and releasing on the descent - in the exact opposite way an efficient driver would.
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You mentioned it had been t-boned. Does the car have abnormal tire wear? If so, has the car ever been checked to see if all four wheels are in alignment?