You can do 75 miles a day on virtually any bike, as long as it fits. I don't say that to be flip or whatever, but to give you a baseline for what is possible. Don't over analyze this. In general...

A road bike will take less effort than a MTB, even if the latter is equipped with slicks.
A triple chainring will make it easier to deal with (and take advantage of) terrain and wind than would a double, or even a single speed.
A touring bike will be more comfortable in the long run than a race or sport bike.
Steel/Aluminum/Carbon/Bamboo... I ain't going there.
Fenders will keep dirty road spray off your bike, you, and your riding partners
Lights will enhance your visibility at night as well as during daytime foul weather
Cycling shoes that allow you to walk comfortably will make bathroom/food breaks more pleasant
Cycling specific shorts will make your on-bike time more pleasant