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Sometimes, I'm just forced to ask why? Is it really so bad where you are?
That being said, I don't want to impose my values on you. However, physics isn't so kind. No matter what, you are going to pay a penalty for wanting to go faster. I'd say, given that the variables also include time, you should assess how much time would be saved by 55 mph versus 65 mph versus 75 mph etc. You said 5 hours, but that doesn't give us a good idea of distance. Are you saying roughly 300 miles? More? Less?
Anyway, in my opinion, you'll want to first assess how much time you're actually going to save by going 10 to 20 mph faster.
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