Energywise tyres

[CR6ZZ]

OK, there have been a heap of ads on TV lately extolling the virtues of "fuel saver" tyres. They apparently have lower rolling resistance and are supposed to save you money.... According to the ads they "meet performance benchmarks for rolling resistance (fuel efficiency) and wet grip (stopping distance in the wet) on top of the safety and construction requirements under New Zealand rules and legislation" but does anyone know how they are for dry grip/road holding? I guess what I'm asking is, is any safety being compromised in the pursuit of fuel efficiency. I have a relatively high performance car (Audi S4) and fit the best tyres I can afford to allow me to utilise the cars performance within legal bounds (Michelin PS3s). The energywsie webpage tells me there are currently no fuel efficient tyres available for my car. I appreciate that 90% of motorists really don't care about how their tyre hold the road and the vast majority won't exploit their cars potential. Any thoughts?