I would tend to think if the truck CAN attain the stated mileage, it is only for the regular cab, 2WD. Since the EPA (or whatever it is in Canada) doesn't actually drive the vehicles, it is only a 'possible to attain' based on their computer modeling.
Does anyone drive a vehicle concentrating on getting the best possible mileage? I have tried and it gets unconfortably unsafe quickly running 45 in a 70 mph zone, or just too tedious after 10-15 miles. I used to regularly run I-45 between Dallas and Houston and several times set the cruise at 59-60 on my F350 to get the best mileage and each time was passed so many times and caused backups in my lane that it was impossible to continue.
There is a local (now expanding to several other areas) talk show "Car Guy Show" on Saturdays--just yesterday there was a conversation about the Ecoboost in the 150 and he said it is an impressive engine and would get 22-25 when driven correctly. Reynolds is the former owner of one of the largest Ford dealerships in TX and the nation and knows Fords very well--so maybe, just maybe, 30mpg in Canadian gallons COULD be done.
But towing will be a different animal for mileage--the 6 will have to work pretty hard with the turbos purring I would think.
'05 36TK3 Mobile Suites
'10 F450 new to me
'09 F450 Lariat 4x4--died