1998 Bmw 540i gas mileage Source Source Source Source Source Source Source Read Also: 1998 Bmw 540i sedan gas mileage 1998 Bmw 540i sport mpg 1998 Bmw 540i 6 speed mpg 1998 Bmw 540i fuel mileage 1998 Bmw 5 series 540i mpg 1998 Bmw 540i sport package