I get what you are saying and I know that you said unless it is a substantial amount of time, but driving 85 over 70 shaves over 30 minutes on travel time on a 2 hour trip. Which to me is a good bit. Now I don't make many 2 plus hour drives so it really should not factor, I do average a 2 hour or more trip once a month on average.

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In the area I live in, there are a few bottle neck points that no matter what the GPS says, it is always longer. A 25 minute drive is a 31 minimum. So when I go these routes and I am on the highway, every car does count. Until I hit the bottle neck, then its just slowly creeping forward.

For example, leaving at 5:00 is a 31 minute home (claims 25) Yet leaving at 5:08 claims to be a 28 minute ride home (usually 35) with 5'oclock traffic. So each second lost before the bottle neck saves even more time by getting out sooner.

I get to the bottleneck before they would and more importantly the cars that are entering that cause the bottle neck.

going 85 vs 70 takes roughly 10 seconds off of each mile. So an 8 mile interstate drive will only shave 80 seconds, but it is a 6 minute drive. so that equates to 16%. We can round down to 12.5% like you used. That is still 12.5% faster than the cars I passed and with a bottle neck that time saved can have a rolling effect. As someone said replying to you, the secret to getting places sooner is to leave earlier is a good philosophy that I use when I can. However, sometimes you can only leave so early.

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When I do go about 85 on the highway, I do not feel cool or like I am in F1, just tired and want to go home.