I've notice my mileage isn't the best until my tranny warms up above 120*F. Hopping on the highway on a cool 30*f morning it took me a good 20 MILES to get up to 120*f on the tranny. I reset the MPG on the dash and was only averaging 16mpg up to that point, once the tranny got up to 120*f the mileage started climbing and settled in @ 19mpg crusing 75mph My Fusion is the same way, cold start winter mornings drop my MPG atleast 3-4mpg, some nice -10* mornings my tranny never warms up enough to lock the converter on my 12.5 mile work drive!
2012 Candy Red XLT Scab 4x4 5.0L "Loaded Minus the tailgate/box steps!"
2010 Fusion SE 2.5L
1996 Thunderbird 3.8L V6 with 274rwhp/299rwtq @ 8psi
CAT 793D - 2350hp v16 - 240ton payload - Company Supplied work truck!