After 8 tracked fill ups here’s what my GT is averaging:

I didn’t log fuel in the Ecoboost but I averaged between 23 and 25 mpg. I use regular for the GT and my Ecoboost needed premium once it was tuned, so the cost difference isn’t too bad.

For a 435 horsepower V8 pushing a 3800 lb car what more can I ask for?