I have @ 300 miles on a new 2010 F150 screw platinum, with the 5.? v8, 355 rear. My mileage has been terrible. I am getting 13.3 currently. Is the mileage supposed to be this bad during the break-in period ? I was getting better mileage on my 08 F250 cc 6.4 diesel, and that was bad. I hope it will get better. What type of mileage should I expect on the highway and city ??
Thanks ! Wade