Stiles,
You need to be an accountant or mathematician now a days to get the best deal. I have a spread sheet comparing the three Diesel stations, cost, distance and savings based on estimated number of gallons needed to fill the tank. Sometimes it was better to spend 15 cents a gallon more and not drive the extra 20 miles, obviously it was not an empty tank. I know what you mean.
I do the same with trip planning. I look at the shortest route and then the quickest. Since my max speed is 60 and I try to stay around 55 the shortest route may be the most cost effective. Coming home this Monday I cut 20 miles off the trip making it 70 instead of 90 by using the shortest. Not a bad drive in the middle of the day.
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