Keycase situation, check your tyres are inflated properly, style of driving is important, throttle use and braking hard contributes as well as what kind of fuel you use, high octane fuels make the engine more efficient, plus the fuel tank to all volkswagons great ideas of motoring has cut the size from 55 litres to just 50 why i don't know? It shouldn't matter so much on the setting of the chassic control but the harder the setting the less settled the fuel will be in the tank so the reading will change more frequent.