Start using the fuel logs, let's see what your changes are doing.
My TJ is going fine. But about the greatest mechanical boost for me seems to be tire pressure. I've tried a few grill block variations, but without any conclusive results. I'm thinking a full blown front nose makeover will be a better option, like the ones mentioned in the link in this thread.
I like the soft top, especially in the summer. My hard top just sits in the garage - two years now.
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