Has anyone used any garage or aftermarket products to boost the power output from the standard 2008 1.8L petrol engines? I think mine is either the R18A1 or R18A2 engine. Stepping my foot on the pedal it seems sometimes rather underpowered. Also driving something like 85% A-road/motorway driving and 15% urban traffic I seem to achieve between 30.5 to 31.9mpg depending on traffic conditions. Is this what you guys are experiencing too? Would like some advice on what are my best options to add a moderate boost to the power output (about 10-15% boost would be good) from the standard 138bhp that this engine is stated to produce. Thanks in advance.