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My Insight is rated 49/61 with the new EPA numbers, and 61/70 with the old numbers. On the highway at ~60mph and without A/C, I see 70-80mpg typically (my best tank was 78mpg). Running the A/C can drop it as much as 10mpg. Driving on backroads with a low speed limit and no stops (40-50), 100+ mpg is not abnormal. Recently I was sick for over a week and was using my car to drive to school each day, only about 3 miles. The weather was cold, and I was seeing <45mpg typically, even using my best techniques. My wife has even had a few 35mpg trips from heavy traffic.
Cooler weather lowers MPG. Stop and go lowers it. Short trips lowers it. High speeds lowers it.
The more time you can spend driving without accelerating or decelerating, at low speeds, in warm weather but without A/C, the better your MPG averages will be.
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