1997 Bmw z3 1.9 gas mileage Source Source Source Source Source Source Source Read Also: 1997 Bmw 7 series gas mileage 1997 Bmw 528i gas mileage 1997 Bmw 3 series 318i gas mileage 1997 Bmw z3 roadster gas mileage 1997 Bmw 3 series gas mileage Gas mileage on a 1997 bmw 540i