Well as I am not exactly cruising it around at sub 50mph, and still having with fun with it as a new toy, I think 15mpg is ok
My Mrs V5 beetle only does 250 to a tank scooting around town which is what I would compare my mpg to, so as hers is only 170 bhp, and mine slightly more!!, I think I am doing ok!
I've not done any runs in it yet as I would like to keep relatively local just for the first few weeks to make sure all is well, but I know I am getting double what a mate of mine is getting from his Windsor (efi ) engined Capri making the same sort of power.
It's not my daily, so maybe I drive it a little harder than you would as an everyday machine? I don't know!
Weeksy