When comparing tyres it is only a true comparison when the tyres are the same age and condition ( tread depth ) as even the Yokohamas seriously go off the boil by about 5 years old.
Its fair to say we cannot judge a tyres qualities if it has a bit of age to it and some of us would be in for a bit of a shock when we check the date codes on our tyres.
The mini being such a light car the grip is more important than most as the tyre contact patch is small so where a modern heavy car would happily go around a slippery road with the driver blissfully unaware the mini can get a little twitchy.
Another thing worth pointing out is tire and wheel weights ( unsprung weight ). When I personally weighed them a Yokohama 165/70-10 is 1 kg lighter than a dunlop Aqua jet 145/70-10. That`s a 4 kg weight saving, so on a 998 mini with if you`re lucky 30 bhp at the wheels you will notice the difference.
I had a guy come around with next to no budget wanting to get a bit more power out of his early 80`s bog standard 998 mini with 13" wheels. As his tyres were worn badly I told him to borrow some 12" steels off a friend and report back his findings. He reported actual acceleration ;) and the brakes worked better.....nuff said.