Recently I have started to drive my car slower on the highway in order to save money on gas. However, I feel like I am spending at least as much fuel as before. One possible explanation that I thought of is that now I am decelerating/accelerating more often.
I used drive at a steady 70-75 miles per hour. Now, I try to maintain about 55mph, and because I am more conscious about my speed and look at the speedometer more often, I feel like I bounce more between 50 and 60 mph and do not maintain a constant speed as well as before.
I understand that accelerating often results in a massive loss of fuel, but I believe drag generally increases by the square of the velocity, so going faster takes a lot of power as well.
Regarding aerodynamic information, my car has the shape of a standard pick-up truck.