I Do myself no favours!
Always large engined (2.0+) always Petrol, and always RWD Straight 6's..
I can't help it, I like to DRIVE!
Current daily is the 326i- current mods, Tyres at 42psi and front lowered.
It could use a cover under the engine, the roof rails off and some other trick pieces, however it's never Idle long enough for me to work on it.
Car has LPG conversion- an old skool single point one- not exactly uber efficient..and you use circa 205% more LPG than petrol due to lower calorific value/litre.
I've had vapourisor leaks (19mpg!!) and all sorts, but finally got it running ok. Most of the LPG tanks are at, or about EPA figures..so I count that as being 20% up!
The petrol tanks are easy to exceed the EPA