Just replaced tyres on our 2007 C5 2.2 DW 12 twin turbo diesel with 6 spd Aisin auto. It is 43000 km since the last 3 replacements which averaged 33500 km each set. The tyres were, and of course the replacements are Goodyear Efficient Grip. Size is 215 55 16's. Just thought I would pass on my finding at last something which lasts on the C5.

Don W.