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Originally Posted by crhemi
300C 10300 miles
Ok, today I get in my car and see that I need gas. Check my average (16.5 mpg) reset at every fill-up.
Flashpaq is on the way so I decide to try a little high octane today (93).
Reset, drops down to (7 or 11 can't say for sure) as usuall it starts climbing to where it left off (16.5) and keeps climbing to 21.5  within 7 miles through town averaging 30-50 mph 2 stop lights.
Its never done this before. Anyone else experiance anything like this?
Time to do some math.
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Depending on many factors, your figure can vary greatly in such a short trip...it would be interesting what you experience after a whole tank is gone and drivign the same way and distances as you ususally would.