Hi Buzz70:

___Whenever I fill from an absolutely dry tank (< .2 gallons left) or especially when I fill the vapor recovery HW, the first few miles are driven at incredible mileage per the FCD. I once had the FCD pegged at 150.0 mpg for maybe 2/3 the way home from the local BP station and it’s 5 miles of city type driving away. As the charcoal canister drains liquid fuel, it bypasses what the FCD measures and you are essentially receiving free mpg according to the FCD until everything balances out again. I feel this surge and see the wild mpg for a few miles after one of these super fills but it goes away after a few miles and the FCD begins to act normally again. At least that is the way it works in my Insight. Most don’t fill there tanks up to the filler neck, have never filled the vapor recovery HW, or drive their automobiles until the last ¼ gallon or less is left in them. Some Hypermilers (I qualify) tend to do all of the above and with that, I have seen and felt the exact same thing you described and it is not a Lean-burn to NOx purge event causing it but the vapor recovery HW doing its job. Again, it does not happen every time but usually after a Vapor Recovery fill or from an almost bone dry tank to filler neck when the vapors are most pronounced and must condense in the canister for a burn without measure as I tend to see it.

___Kenny, 10% off? No way are the pumps that far off. I will do some searching on this topic over the next few days but I would be surprised if the pumps are 2% off at most.

___Good Luck

___Wayne R. Gerdes
___Hunt Club Farms Landscaping Ltd.
___Waynegerdes@earthlink.net