The 3.91 diff is not that bad on the highway, I actually feel the lower numbers are too long. I'm turning about 2k rpms at 60mph. This is on par with my e46 328ci which has a 5 speed and a 3.64 I believe. Plus unless you have a loud exhaust you won't even hear the engine at a higher rpm if you're doing say 80-100. Maybe I'm just used to when I had a 90s Honda and that thing would do 2500 rpms at 60!
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