I haven't gotten 31 mpg.. but I was able to get around 26 mpg using 8th gear. Yes you're right, I only use 6-8 on the highway. For really aggressive driving I keep it in gears below that range. It's not hard to keep track of like one would think. By the top of 4th gear you're already over 100. I believe 8th gear at 110 mph is around 2600 rpm.
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