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For going home, if you can pulse and glide on the backroad until you hit the hill then I would think the backroad is better. Go up the hill at 50%+ throttle and P&G some more home. I don't think P&G would be practical on a steady uphill on the interstate for you.
However if you are not opposed to drafting, stay 2 seconds behind a transport on the interstate and you'll probably beat your MPG on the back road plus get home faster. I had the fortune of getting a draft all the way home from work yesterday and got 53.5 MPG out of my neon, typically I get 36 MPG on the same route doing some P&G.
Once you get your scangauge, you'll answer your question in two trips home and you'll see how far back that drafting works!
Ian
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