Not only do I get more mileage, the H/T Plus tyres are much quieter and give more grip.
I had Coopers fitted before taking delivery of my past three 4WD's and in 7 years I haven't had to replace one.
Last year, I bought a new Rangie and decided to wear out the original tyres before changing to Cooper but I only got 55,000km from the originals so that was a mistake. When I sold my past 4WD's the Coopers had done 80,000 - 90,000km. And, not only do I get more mileage, the HT Plus tyres are much quieter and give more grip.