Re: Upgrade to...?
Congrats on the addition!
Don't let fuel economy fool you here. A 4.0 Sport Trac can get similar mileage to a F150 with the 4.6L engine and 3.55 gears.
My service van is constantly under load, be it trailer, payload, you name it and today I filled up and achieved 14.84L/100km, or around 16 US mpg. It has the 4.6L 2V engine with 4.10 gears.
Motor Trend did a long term test with a F150 crew 5.4 V8 (2wd) and a Sport Trac 4.0 V6 (4x4) and both achieved the same fuel economy. I'm not sure what gear ratios they ran in the axle(s) but if you have the space to park a F150 and think a larger bed would be useful then it would be my choice. It might also be cheaper to insure a F150 as there are SO MANY out there and parts are relatively easy to find.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!