fuel consumption and mileage at 540 km per full tank on a 520i ?
if you are not really bothered with paying the extra roadtax .. .. get a bigger CC car, the engine is much more efficient and better still you get all the power on tap. here is an example of why...
my bigger cc 528 m52b28 gives out a mileage of an average of 530km/tank of petronas and 550km/tank of v-power and that is only daily city stop and go traffic. daily routine illustrated below...
damansara (fairly smooth traffic) >> KLCC(JAMMED)>> DAMANSARA (JAMMED)>> bangsar >>daman...... averages 530-550 depending on fuel i pump.
On two of my road trips down to Singapore with constance heavy footing and speed of an average of 170ish, it averages close to 750km /tank with v-power/petronas with 3 passengers and about 50kg load of stuff in the boot.
Damansara>> TUAS >> singapore
only mods done to the car is a k&n drop in filter and a supersprint exhaust system.
case in point.... there;s no replacement for displacement....