I think what I'm unsure about is when I look at the numbers using simple math, whether its 30 inch tyres or the 3.55 diff, the difference is only about 10 or 12 percent.
Which would increase my speed from 40 mph to about 45. That doesn't seem like much of an improvement given the expense involved.
So I'm wondering am I missing the point. I've read reports of people getting massive improvements and happily driving down the highway at 60 mph. Is there more to it than what the simple math calculation indicates?