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Normal refills occur when one fuel bar is remaining.  I do not top off the tank.
Highest Tank ==> 68.0 Lowest Tank ==>  40.3
Averages ==> 54.4 60.1     500.4 14.9 50538.4 9.3 928.2
Date Tank
MPG		 Lifetime
Average		 12-Month
Average		 Average
Temp. ºF		 Delta
MPG		 Tank
Miles		 Tank
Days		 Total
Miles		 Refill
Gallons		 Total
Gallons		 Notes
08/28/07      66.7        52.1         57.70 71.3 0.0 678.8 20 36027 10.810 692  8. Saw 67MPG for a few days then the rain came. 
09/15/07      65.1        52.4         58.28 67.5 -1.6 660.8 18 36688 9.001 701  9. Maybe I can squeak out one more 60+ tank this year. 
10/02/07      68.0        52.5         58.36 67.5 2.9 612.4 17 37300 9.500 710  10. New record!  In October!  What's up with that? 
10/08/07      63.0        52.6         57.90 71.3 -5.0 564.9 6 37865 9.384 720  11. This tank was more than 75% highway miles. 
10/15/07      64.9        52.8         57.94 55.2 1.9 596.5 7 38462 9.175 729  12. First 375 miles were highway miles.  The rest as normal. 
11/02/07      59.5        52.9         58.39 53.5 -5.4 556.9 18 39019 9.021 738  Finally dropped below 60mpg.  Temps and short trips contributed. 
11/17/07      59.5        52.9         58.36 41.84 0.0 543.6 15 39562 9.430 747  Such a high tank surprised me given average temperature. 
12/04/07      55.3        53.0         58.18 32.6 -4.2 478.4 17 40041 8.255 756  Cold temps and short trips brought it down.  Was holding high 50s. 
12/15/07      53.4        53.0         58.28 23.42 -1.9 450.5 11 40491 9.003 765  This tank was Chicagoland gas.  Next tank from Wisconsin. 
01/04/08      55.8        53.0         58.58 28.8 2.4 485.0 20 40976 9.053 774  Temp and Mileage up.  Wisconsin gas. 
01/18/08      57.8        53.0         58.49 33.1 2.0 509.6 14 41486 9.068 783  Surprised at the MPG.  Was in 58 until right at end. 
01/31/08      50.1        52.9         58.52 14.7 -7.7 438.1 13 41924 9.144 792  Temperature was a major factor as were a couple snow storms. 
02/14/08      53.6        53.0         58.70 22.6 3.5 461.0 14 42385 8.409 800  Major snow storms during this tank.  Temperatures improving. 
02/27/08      51.9        53.0         59.11 19.1 -1.7 458.2 13 42843 8.409 809  Cold weather and snow storms and short trips. 
03/10/08      56.2        52.9         58.91 24.7 4.3 493.6 12 43337 10.248 819  Hopefully the temps are on the way up. 
03/25/08      59.3        53.0         59.27 34.3 3.1 571.4 15 43908 9.132 828  So frustrated.  450 miles at 60+ MPG and then major snow storm. 
04/14/08      58.8        53.1         59.79 40.7 -0.5 561.5 20 44469 9.304 837  With higher temps I expected better mileage.  Just didn't happen. 
04/28/08      66.9        53.2         59.77 51.2 8.1 601.3 14 45071 9.175 847  1. First 60+ tank of the season.  Was at 67.8 but then bad weather. 
05/19/08      62.7        53.3         60.13 49.8 -4.2 584.4 21 45655 9.289 856  2. Was hoping to get higher but will take another 60+ mpg tank. 
06/06/08      65.9        53.4         60.08 56.7 3.2 624.2 18 46279 10.161 866  3. Relatively chilly weather so far this season 
07/02/08      71.2        53.7         60.37 68.6 5.3 700.2 26 46980 9.509 875  4. First 70+ tank!! Yippee 
07/23/08      72.2        53.8         60.27 70.6 1.0 663.6 21 47643 10.091 886  5. New personal record.  
08/05/08      71.3        54.0         60.76 72 -0.9 492.5 13 48136 6.500 892  6. Rotated tires, bad gas?, short tanked prior to trip. 
08/10/08      63.8        54.0         60.43 69.7 -7.5 467.4 5 48603 8.254 900  7. Almost 100% highway miles. 
08/20/08      64.9        54.1         60.56 68.1 1.1 664.6 10 49268 10.504 911  8. About 75% highway.  Disappointed with mileage. 
MPG is tracked on the left axis and temperature is tracked on the right axis.