local 6 kmpl (or less), long 8 kmpl.... just sold our 93 intercooler 2 weeks back.... the 3.5 v6 petrol does better mileage than it 8.7 kmpl long. not that much better but consider that the intercooler has 97KW of power, where as the GDI (petrol) has 158KW!!!
p.s and considering current prices, the gdi will cost considerably less if it is to be used as n everyday use vehicle. taking the lower price + the better average into account...