Fuel saving tyres, the difference between the high ratings and the lower ratings for rolling resistance amounts to 25% for the tyres, In a lab test a top tyre had 41 Newtons of force opposing motion, the worst 52 Newtons , this does not translate into a 25 % fuel saving by any means, there are so many other factors affecting fuel economy, for example at motorway speeds the differences between tyres are effectively zero,