Anyone got an idea how many miles you should get per tank, I'm running a 600cc unit?

I recently got 300KM just before the low fuel light came on. Mixture of high speed motorway driving two up with small luggage in my 500R, 594cc lump

Rob

Thanks Rob

Averaged out over many consecutive tank-fulls and a distance of more than 1500 miles my car recently achieved almost 61 genuine mpg. That equates to about 240 miles per tank and about 180 before the low warning light.
I realise this was fairly ideal conditions but I think you should get at least 200 from a tankful.
It's a 652, which I think is slightly more economical than the original 499.
I find that I can squeeze a fair bit more than 4 gallons in if I'm careful.