Find a Cart that shows HP and TQ, where the two lines connect is going to be you best power, that does not mean drive there thats just the best place to shift if your trying to build speed the fastest, or go Straight up a Mountain Side. I would think driving should be a lower than that, but if Red line is 5,5K then 3.7K to 4.7K should not hurt a thing. That's a lot higher than I like, but I have a 4.2 that may not even pull 4.7K in any gear. I run my Harley up there all the time. Jap bikes run 14.K and more.