The LT4 that was in my Z06 only used a fraction more fuel (when driven responsibly) than my ridgeline, it was very close. Premium fuel vrs regular though.I daily drove a 2009 Pontiac G8 GXP with an LS3 V8 and a stick shift for 2 or 3 years. A rare car (the GXP model) that never actually was sold in Canada - I ended up flying down to Nebraska and drove it back. That was when the CAD was on par with the USD. There was maybe 2-3 in all of Canada. Think of it as a 4-door Camaro.
As much as I loved that car, the frequent fuel stops got old after awhile.
If you've got the means to swing it, I'd recommend a car like that as a toy that comes out on nice days and have a fuel efficient daily for the grind. The days you end up driving the toy are special, just like the days you get on the bike.
So the Mustang isn't on your radar?