Ok I stand corrected.... by chicken farmer.  2010 Freelander 2 Select TD4 auto....gone
2011 Freelander 2 TD4 auto ...current

your not the first  At work
At home

"I can't always believe facts I read on the web" - Charles Dickens

winner by default of the tractor vs caravan race

For tyre / wheel combinations vs speed corection try this:
http://www.miata.net/garage/tirecalcold.html

Plug in the original spec whell and tyre sizes, against the new, and it will calculate the speedo error. This will also affect the error in the odometer. Obviously a smaller overall tyre compbo will travel less far per unit time for the same engine revs equalling an apparent higher MPG.

The bigger wheel/shorter tire combination concentrates more weight at the periphery of the wheel/tire and a larger wheel puts it further from the center for rotation. Both of these increase the moments of inertia (rotational analog of mass) of the wheels. Hence, it takes more torque to get them moving.

Blimey Wizking, you've certainly been doing your research! http://www.answerbag.com/q_view/361223