Assume that is a lifted and one or two tire size up 200 vs the 250 GX?I got about 20-21mpg in the GX driving from Tulsa to Denver.
Vs the 12mpg I get in my 200.
On my near stock 200 series (do have a rhino rack for our 18ft hobie tandem island sailing kayak and airbagman airbags for our travel trailer) I get 17 mpg on the highway (without kayak obviously...). At regular vs premium fuel it seems there is really no $$$ saving for the GX550. Here in Houston you would spend slightly more on running the GX. 17 over 21 = 0.81 and $2.49 over $3.33 = 0.74. To be honest, that is not really a driver when you buy a body on frame 200, 250 or 300 series.