Wednesday, December 12, 2007

Tank 140 - 12 December 2007

My theory that the Woodbridge Costco's gas pumps automatically shut off
sooner than those at the Fredericksburg Costco got a real boost today as
I filled up at Fredericksburg this morning and found my calculated fuel
economy to be just 35.65 mpg.

This economy is over 4 mpg lower than my last tank.

My last tank was 2 mpg higher than the tank before that, and this tank
is 2 mpg below that one.

The average of my last 2 tanks is the same as the average of the
preceeding 2 tanks (using my eyeball calculating technique).

What does this mean? Probably that in order to be fair with each tank,
I should refuel at the same exact pump each and every time. In reality
I won't be able to do this too often.

Maybe I ought to track the pump number at the gas station as well, to
see if any relevant data can be gleaned from a few months worth of data
there.

I'm definitely going to need a bigger notepad.

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