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Not sure how this correlates, but when i use 87 octane my mpguino displays about 3-4mpg higher than what I calculate from odometer and pumped gallons, than when i use the 91 octane no ethanol added from the same gas station.
When i use the 91 octane stuff, the mpguino is basically dead on with odometer and gallons at pump calculations.
Anyways, i use the non-ethanol stuff because i've noticed the ethanol stuff screws up small engines, and i get 3-4mpg more from the more expensive stuff.
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