Quote Originally Posted by ProECU
Driving techniques aside... fuel efficiency is a bi-product of mechanical octane.

Things like effective piston & chamber design and the clearances between these two is a major contributor towards fuel efficiency.
So too is quality of fuel atomisation & combustion quality...

Side note, have you guys ever wondered why a golf ball is dimpled?....

+10 Rep to anyone who can give me a precise answer.
The dimples aid the rapid formation of a turbulent boundary layer around the golf ball in flight, giving more lift. Without 'em, the ball would travel in more of a parabolic trajectory, hitting the ground sooner (and not coming straight down)Despite the drag, a dimpled golf ball can even go further in air than it would in vacuum given the same initial velocity and low angle. However, a golf ball shot at 45° and 70 m/s in vacuum would go 500 metres to the first bounce, which exceeds all records.

there ya go mate i did an assignement on this in yr 9