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I would tend to agree with John's hypothesis. The more you EOC the more voltage you loose, and that energy then has to come from the alternator. It takes around 7hp for a small car to cruise and an 80A alternator can output 1.5hp, if the alternator has a lot to do you can see that can be a big hit to economy.
When UFI got a battery twice as big as stock, my MPG went up by as much as 15%, I charge it at home and the alt has nothing to do for at least the first 140 miles.
If you've got a lightweight car with poor aero, I've found EOC to be ineffective.
If you've got a 2 ton van EOC works at freeway speeds. I've adding a solar panel to my 1.5 tonne van roof next week to offset the EOC battery drain. Personally, I expect significant gains. Right now I often EOnC out of kindness to the battery when the voltage is reading a bit low already.
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