Short trips where walking or biking would be possible, are the trips where your car gets the worst MPG. It takes a little while to warm up and then you orbit a parking lot or look for a street space just to shut it off and do it all over again. It's also good to plan and group a day of errands or shopping for the same reason. One 10 mile outing in Wednesday is better for FE then 5, 2 mile outings every single weekday.
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