As a technicality, there are a few spots in Texas with a speed limit of 80 or 85. (The only 85 mph location is a specific portion of a toll road south of Austin.)So, to warm up the battery enough, you have to risk a speeding ticket or being charged with reckless operation? That's craptastic.
To my knowledge, there are only 2 states in the USA that have 80 mph speed limits. Montana and Nevada.