will be down to the cold matey..i jus bought a cossie an had a 200mile drive home..was fookin freezin. When at spd the needle would jus lift into the white square.
one trick it to tie a piece of cloth, or cardboard over your rad (i wont do this cos i have a front mount cooler), start with a piece around A4.
This will allow to the cooling system to keep hold off some heat, but keep a close eye on the guage..