fill up, reset trip odometer, measure when it gets REAL close to the end, like when DTE says 10. THat will give you a good idea of how much your car gets.
I will say, my wife's 2013 Escape, when we got it new, for about the first 2,500 miles barely got over 200 miles per tank, and now, about 10k in, we can get 250-260. Not great, but not the worst.
I get about 220 in my GT, average.. you should be in the 260-300 range I would say with the V6. I will tell you you're gonna be disappointed if you expect ANYWHERE NEAR your mazda.
2012 GT Premium - some mods are on