I just did both routes and calculated FE at the end of each tank. I wish for me it was better to go to the highway, but the lower FE i get in city driving compared to Highway does not offset the difference of the actual miles.
The 2 ways for you would be to do it this way or hook up an MPGuino to your car to get the trip mpgs
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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