Lower temperature does not mean better.Oh, my 147 does the same, hovers between 70 and 80.
Has done this for as long as I`ve had it (about 2 years) and runs really well. I always had the idea that a lower temperature is better??
Lower temperature means the oil is thicker, parts are not expanded correctly, coolant is not flowing correctly and your wasteing fuel. This all causes damage to the engine and components in the exhaust, parts will wear quicker as the oils not flowing properly, tolerances are too tight and things could stick (valves in guides etc), should the engine get too hot there would be no reserve of cooler water to flow round the block AND the lambda/s and cat can be blocked by the extra carbon build up.Lower temperature does not mean better.
The engine is designed to run at 90degC