I absolutely concur with Tony (although I had to reverse engineer it into KM) 
An average of 60 KPH/40 MPH in rural france is about right. If you ride right to the speed limit - you can up that to 70kpH-80 KPH (max 50 MPH) but it can get very intense at that speed.
Mountainous regions - a 60 KPH average is pretty good going on the very twisty stuff - most people find 45-50 kph about right.
(there will be those who claim to go faster - but these figures are the ones that we use to calculate distances as 'locals')

Bill Shaw Mission Motos - Motorcycle Travel Solutions.
Cool Motorcycle Packing Stuff Generally less than you'd pay from the US direct.Discounts at the moment as trying to sell it all off.
www.motorbikefriendly.com - we are always looking for B&B owners (anywhere) to add their B&B's to our free listing. Rider owned and run places especially welcome. Riders resource site - routes etc, ask questions of the locals.
Edited: 22/01/2009 at 19:23