Fuel consumption varies depending on how you drive it. On highway I average around 34mpg (convert to metric as appropriate, american gallons not brit), in sport with a lead foot it’s in the low 20s.

I’ve kept mine stock, in my view its greatest strength is that it’s a powerful performance coupe with plenty of daily comfort, it isn’t as good at being a dedicated sports car. Live with it for a while first rather than rushing to spend money on mods.