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JamminJimmy-Congrats on the 40+
Spend the money on the MPGuino and then you will always know you MPG (instant and tank, and trip numbers). Even your full tank records can be wrong or off a bit. Go with your 3 tank or 90 day average for consistency. Be patient. Remember the goal is to SAVE gas not buy it! ;-)
BTW Frank is always right!
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