There is no difference in terms of mileage between Fiat Linea Classic and New Classic Petrol. Both of them have the mileage of 14.9 kmpl (highway) and 11.4 kmpl (city). Both these cars use the same engine that produces 88.8bhp. To find out about the differences between the two cars please visit the link below http://www.cardekho.com/compare/fiat-linea-and-fiat-linea-classic.htm
The Linea Classic is dimensionally identical to the regular Linea model, but it misses out some of the features to keep costs down. It doesn't feature climate control, rear AC vents, leather seats, steering mounted controls etc.