I am being stumped. I have had my z for about 3 months now and I feel like it wastes to much gas(like 11 mpg bad). I have checked my wires, checked for vacuum leaks, changed the fuel filter, spark plugs, air filter and keep my car well maintained. It smells like it is really rich but i don't know how to adjust that. Also does anybody know where to find a rhd conversion for the z31 or does it just not exist as a kit. Thanks for the time.