How do I find out engine size of my 2018 f150 truck?

Is there any where else I got the truck used without the window sticker

I have the same question I know that ford made 2 3.5L V6 ecoboost's One for the Raptor and one for the base F-150. I bought my truck at ford and the sticker just said 3.5 TT ecoboost. but to date I am getting the fuel mileage of the higher output Raptor engine not the base. So I'm wondering the same, how do you find out which engine is which. Ford is useless when talking to them they keep saying ... your driving hard, and I've run that thing like a grandma in ecomode for 3 tanks and still getting the higher mileage. But I can't see ford putting the higher end motor in the base model, unless they screwed up and did which means I am paying more gas than expected.

I have 2014 f-150dont know if its a 3.5 or a3.7