[Giffer2]

I'm just playing with the underbody aerodynamics of the car and just wondering as a starting point, what are people getting MPG wise on their Merv Dervs and what type of roads they use?

Mine is good until you go above 60 at which point the MPG seems to drop

 

[mrgrumpy]

50+ mpg consistently. Mix of rural, urban and motorway. Use cruise control where possible and a/c when outside temp. permits. Correct tyre pressures, reasonably light right foot and defensive driving.