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Wow... that is a very drastic change. Ideling for 10 min shouldn't have an affect. What type of fuel is your local stations carrying? Is is straight #1 or a blend?
My van, I'm just between 1/2 tank and 3/4 empty and if I recall right, I have 300 or so miles on the trip odo. Granted, I think it still has summer fuel in it (just bought it last week.....surplus van that sat around)
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1999 E-350 Cub Wagon, 7.3L Power Stroke, E4OD, 3.55 
1990 E-350 Club Wagon, 7.3L IDI, E4OD, 3.54LS  x2
1983 F-150 2x4, 4.9L, C-6 w/GV-OD, 3.55 Farm pickup
1981 C-8000, 3208 CAT, RT-6510, Rockwell SSHD Tandems (Swap) 
1977 K100C, NTC-350, RT-1110, Tandem
1977 Transtar II, NTC-290, RT-9509 Single
1977 Transtar II, Formula 290, RT0-9513, Tandem
1974 C-750, 391CID, Clark 5 speed, Eaton 2 speed
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