weight ballast( including ourselves), rolling diameter of the rims, inertial weight of the rims, climate control setting, driving with the windows down on the highway etc etc. all are factors. setting the vents to the defrost setting even with the switch off still engages the A/C as well as the temp setting too far in eithe rdirection will trigger the compressor too. try playing with those settings.
here are some of my distances. Chicago to Toledo or Indy leaves me with, say, 3 bars on the gas gauge. that's with a 70-75 mph speed with mostly cruise, three people and luggage
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