Hi everybody there, I just want to share: the battery of my X5 4.4i/A 2004 died then I put a brand new 100Amp and the car´s simply mutated into a powerfull beast, dropping the gas toll from 20L/100km (no matter the speed) to the impressives 15,8L each 100km (running at 200km/h speed).
At 170km/h is 15,4L/100km.
In % it´s a direct 26% improvement in gas mileage
I didn´t know battery was so (SO) related to gas mileage.