[Boeing Guy]

I could not agree more Neil, BMW have been leading the move to 'Lean Burn' engines in recent years, the uber efficient 320d only emits 109 carbons and is £30 road tax per year, still goes like stink and returns a real world 60+mpg. Ironically M Thatcher, wanted to push lean burn back in the 80's, but the car lobby managed to lobby against the idea and instead went for the much cheaper catalytic converter instead.
We have to find an alternative to internal combustion engines, but whether that is Electric or not we will see.

Russell, love the i8, but I too also have a car that can go above 40 mph, some say it's limited to 155!! Cannot say I have been there! and it's a gas guzzler, it will be my long suffering other halls car when the Estate arrives in a few weeks. Nice to know my V6 is nearly as economic as your 4x4 !