'94 F150 4WD super cab short box 5.0 V8 EFI, E4OD a/t
'06 Silverado 4.8 V8 4sp a/t No mention of cyl deactivation.
They could be quite similar. Fuelecon.gov shows 14/15/18 for the Chev and 12/14/17 Ford.
Yes it has been bitter (waaaay below zero) cold lately. But I haven't used it much lately either. Yoosta figger 18 mpg average when it was a newer truck. Maybe at 108M it's time to replace O2.
P.S. It has these Dayton Daytona SR tires:
http://www.regionaltire.com/showcase...d=80&Type=3009
Haven't found any r.r. data on them, but they were the "ribbiest" (vs "blockiest") treaded tires at the store.