to silent conqueror:
Helo, the 85km/h @5000rpm is normal it is because the ratio of the pinion and ringer of the Mini's diff is set for low speed but good in acceleration and off-roading. Bear in mind that if you change the diff, you would loose acceleration and it's good off roading capabilities. but the good thing is, aside from having a higher top speed, your fuel consumption will also drop significantly. It's a good thing that diff's are available in your country.
I am having a hard time finding diff's that would fit my mini here in our country. I'm not really an off-road, i just like its looks.
Anyways, I do have a question for Ali and to everyone, your response will be highly appreciated. If I remove the front axle and prop shaft, would it give me more mileage in actual situations?? it is suppose to be effective theoretically, but i would like to hear it from someone with an actual experience. Thank You. Also, I would appreciate it if you could help me find a diff for my mini and can send it to me. I think my mini's ratio is 7/46, i would like a hi-speed one. Thanks.