track your mileage and alternate driving both until you can see a solid trend. i think the shorter route with more stops could be an easy winner if you eoc, or had a vehicle that gets similar city and hwy mpg, but with your vehicle i think it would be tight if you can roll through the lights. i used to have a longer commute that gave me a similar choice. in the summer id almost always take the slow counrty road. in the middle of the winter i would always take the interstate because it would be dark when i left and when i got home, and the road was always better maintained
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