What'll REALLY kick you in the dick is the bigger broader picture down the road.
That ranger MAY get 15mpg and that full size with a V8 will get 20mpg
My old boss use to buy the v6 work truck edition chevy's for service vehicles. He got MAYBE 17mpg out of them
So he decided to buy a few rangers to save on up front cost + fuel cost......they got 12-14mpg
He decided to buy 3 new v8 chevy's and they get over 20 plus they were only slightly more money than the rangers.
Over the long term the v8 work chevy's are costing a lot less.
He determined that the drivers of the rangers were giving the little 4 bangers all they had to get up to speed...thus KILLING the mileages. Where the v8's they didn't have to press the gas hard at all. So they weren't working them as hard.