Middletown this morning was filled with early-bird tax evaders. Gov. Frank J. Lausche last night signed a bill providing for a penny-a gallon increase in gasoline tax starting at 12:01 a.m. today, but most of the city's dealers didn't hear about it until 9. Lucky drivers who in the early hours parked before unsuspecting gas men and old fashioned prices motored away with coins that belonged in the state treasury. Ohio, however, expects to add $23 million to its bank account through the tax and may not feel the loss of a few Middletown pennies. Gov. Lausche's signature also made law a provision that an axle-mile tax on trucks go into effect October 1...