AZ-Ted...I go the same route every year to Massachusetts..alot of hiway miles...and yes the amount of gas is roughly the same, I try to keep a steady 70mph on the interstates but occasionally get it up to 80 breifly to do some passing. Also I use the a/c intermittently to keep the family cool. As for acceleration..I overdrive the crap out of it to "milk" the most mpg I can get.