What to check when the fuel consumption not consistent ...

[BiMmEr78]

Use to get 550 to 600 anytime .... now only 420 to 450 max

 

[Algino]

When my ride on 245/45/17 rim and tyre , I used to clock 600km to 650km anytime .. However when I upgraded to 245/45/18 and the Max I can hit is only ard 550km .. Therefore must say wheel sizes does matter a lot dude ..

 

[BiMmEr78]

The tyre n rim size is the same from the day 1 my car ownership. Therefore I'm also aware that changes on this will make significant changes. Even I change tyre always look for same size as original

 

[jason.lim]

Use to get 550 to 600 anytime .... now only 420 to 450 max

bro, ur fc same like mine.. r u gonna do something to it? the foreman of optimum workshop @ kayu ara told me he can do a engine reset to learn back the driving style..

 

[Chip Yoose]

I am not sure about this but maybe you need to calibrate the accelerator position sensor. This happened to my E46 before and it solved the problem after the calibration. But I am not sure if it is with the same system with E60. But no harm trying.

 

[TheTaj]

Tyre size does play a role, it's called rolling resistance. A 17" rim & tyre combination will weigh less than an 18" rim & tyre combination. The few kilos difference add up to rolling resistance, the engine and drivetrain will have to work harder to turn a heavier wheel combination.

The solution to counter act this is lightweight rims but will heavy on your pocket, haha

 

[Algino]

But lightweight cant withstand our dreadly pothole in Malaysia road lei .. Used to buy lightweight rim for my Camry before but ended up the rim dented in less than 8 mths times ...

 

[TheTaj]

well. there are pros and cons to lightweight rims...

my E60 running on 18" right now but planning to downgrade to 17" and use 225/50/17 tyres instead of the current 245/40/18, getting old, now want comfortable ride, tried 19" before cannot tahan the bumpiness, fuel consumption was worse on 19"...

 

[Algino]

If 17" rim I will say 245/45/17 the best bro ...