I have a 16v KR Mk2 and at best on the motorway going 70 I'll sit at around 3.5k RPM and I'm only getting around 22 MPG. Around town I'll get around 15 MPG maybe less. Is there anything I can do to increase this number? When idling the car does smell really rich so I'm guessing my main problem is the mixture. Is this something I can do myself at home? I'd love to hear any other suggestions as to why it's guzzling down my paycheck as well, thanks in advance.