When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Update: There appears to be some confusion about battery size application. The Order Guide indicates that a 6.2 truck in XL trim gets the 650 CCA (72 Ah) battery, and higher trims get the 750 CCA (78Ah) battery.
I would think that ATF volume is mute at startup, but I'm an electrical guy with a surprising lack of experience & knowledge on the mechanical side, especially transmissions.
2 & 3 seem the more likely reasons. There are more & more people, myself included, that buy more truck than they need. We've all watched trucks evolve over the last couple of decades. The 150 has become the quintessential family sedan while the 250 has become an entry-level "work truck." From my observations, if upfitting is a serious plan of action, the 350 is the starting point, so it is likely that the greater CCA is to account for the greater likelihood of accessories (load). Especially since a lot of guys don't necessarily wire accessories in properly. One of the best things Ford ever did was to start putting the upfitter switches in the Supers. I wish they would make them an option in the 150s. It would save my dad (& me) a lot of time spent fixing hack jobs that come into the shop. Although, now that I think about it, that is easy money, especially since I have to charge labor to both remove their bad work & to reinstall it properly....
You hit the nail on the head. My buddy calls F150s cars with big trunks.