I have just last week purchased a BMW with a 2.5 litre engine, which is great for motorway driving as I can get about 33MPG out of it but around 21/22 approx for inner city driving.
It has amazing power, great acceleration and really 'flies' on the motorway!
Last night I randomnly stumbled across websites for 'Fuel Saving Devices', 'Performance Chips' claiming that fitting one of these devices/magnets saves fuel and increases fuel economy?
Just wondered if:
a) Are these Legal or a Scam?
b) Do they actually save fuel/work?
c) Has anyone tried these devices or have one fitted?
c) Is this different to ECU Remapping?
d) What else can be done to save fuel etc? Air Intake Checks/Valves/Filter??
P.S I haven't bought one of these.