As stated in title im only getting 13.8mpg or 17L/100km half highway half suburbs. Stock engine, stock ecu, stock exhaust manifolds and cat into 2.5" exhaust with single muffler. Few questions, does it seem a bit high compared to what other guys are getting in similar setups? Will an aftermarket ecu gain much economy depending on tune? Whats the best rpm to aim for for economy say at 100 kph? The rpm is around 2200 at 100kph, is it worth swapping 5th gear for lower ratio and will 33's make the economy worse?