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Normal refills occur when one fuel bar is remaining.  I do not top off the tank.
Highest Tank ==> 72.2 Lowest Tank ==>  40.3
Averages ==> 54.7 60.1     502.4 14.8 52245.1 9.3 955.9
Date Tank
MPG
Lifetime
Average
12-Month
Average
Average
Temp. ºF
Delta
MPG
Tank
Miles
Tank
Days
Total
Miles
Refill
Gallons
Total
Gallons
Notes
08/20/08 64.9 54.1 60.6 68.1 1.1     664.6 10       49,268 10.504 911  8. About 75% highway.  Disappointed with mileage. 
09/08/08 71.6 54.3 61.1 68.4 6.7     693.5 19       49,961 8.874 920  9. Aimed for a new high but ended with a temp drop and rain. 
09/21/08 68.3 54.5 61.4 63.7 -3.3     580.0 13       50,541 8.500 928  10. Temperature is dropping. 
10/06/08 65.7 54.5 60.7 58.2 -2.6     575.2 15       51,116 9.680 938  11. Might be my last 60+ tank of the year. 
10/20/08 65.0 54.5 60.8 55.7 -3.3     624.1 14       51,165 10.001 938  12. Temperature's dropping. 
10/31/08 63.3 54.6 60.7 46.0 -2.4     507.4 11       51,624 8.004 946  13. Yet another 60+ tank.  Getting new tires tomorrow. 
MPG is tracked on the left axis and temperature is tracked on the right axis.