Re: Fiat Punto
49L is the tank capacity, supposed to be 57 MPG but we'll take that with a pinch of salt.
So 49litres is roughly 10 gallons so if we say 50 MPG that would get you 500 miles say minus 50 miles for stop start stuff gives you 450 miles.
70 out not too huge an amount, if it's been a while since servicing it could be beneficial to get a service, but it depends on your driving style too, you'll likely only get 380 if your doing 80mph plus on the motorway all the time.
Liam