M8 just ease off the pedal, I notice that based on my driving I can get between 15-20 city and 20-30 highway, on my long trip I avaraged 28mpg and sometimes i have done even better then that. Also try using lower grade petrol, the engine will detune the spark a bit to accomodate for the lower octane and that can save some money too, and wont hurt the engine. I know a smaller motor will burn less but pump up the tires 2-3psi above the recoomended, it will be more bumpy but will have less rolling resistance. also you can keep the A/C off most of the time it east 1-2mpg out of it, even in winter time because its used to dry the air...
Around here petrol shot up to around 3.50$-3.60$ in a matter of a week and that is from about 3$... so it hit us big time... and in a month or two we are expecting about 4$-4.50$ and Diesel is already in the 4$ range... and the funny part is you get on the motorway and most of the people are still flying and the gas guzlers are going at light speeds down the road. I can alredy feel it... went from 30$ to about 50$ a tank in a matter of a year... and I only go abuot 240mi/tank... trip home is 300, and its getting expensive to drive I know but you got a nice ride, I wish I can get my hands on one like that.
BTW how would you rate the springs, is it really stiff?