Was gas conversion expensive? Not looked into that for general road use....hit lucky my average mpg is 30 over the last 11 months (28000 miles) I have recently installed a gas conversion that has given me an extra 3-8 mpg at present, but I'm still tinkering with the setup.
My next purchase will be a Roverdrive as I've heard good thing about them.
Best advise I can offer is keep on top of basic maintenance and it will pay back in the long run.
Dave
No little about Roverdrive. Looks like a good idea though. It's all a compromise for me. Want the best of both worlds, a day to day runner, and something to tinker with and play off piste!