above all the safety reason to drive slowly the price of gas as recently made me take it just a bit more easy on the pedal. Take a few more seconds to pick up speed and you'll save a lot more then pennies.
Not singling you out, but to a certain extent that works. But let's face it, the difference in a tank of gas between getting 18 & 19 mpg, is pennies on the dollar per mile depending upon your vehicle. And here's the real world math to prove it:
21 gallons @ $ 4.079 = $ 85.66, that's the same regardless of the fuel economy I get.
Scenario A: 18 mpg
18 mpg X 21 gallons = 378 miles
$ 85.66 / 378 miles = $ .2266 per mile
Scenario B: 19 mpg
19 mpg X 21 gallons = 399 miles
$ 85.66 / 399miles = $ .2146 per mile
That's just about a penny per mile, over 399 miles it's just shy of $ 4 @ $ 3.99 on the tank of gas. That's in a perfect world where I drive in a vacuum on a road with no traffic. With traffic the way it really is, I get just about that regardless of how hard I stomp on the throttle. My vehicle gets more like the difference between 18 and 18.5 mpg in a good week of stop and go traffic. So I might as well drive the speed limit constantly, rather than go into miser mode because traffic is stopping every 2-3 car lengths for about a 5 mile stretch of road on my 22 mile one way commute. When I'm on the road with virtually no traffic and all highway driving, I get 20 mpg and that's doing 78 with cruise control on. As you can see it really makes little difference for fuel economy for me. I can't imagine my vehicle being the only one behaving like this, but there might be some vehicles that the difference might be more noticeable ?
Now laying off the throttle usually costs me at least 10 more minutes of commute time each way with traffic stopping and starting. So over the course of a 5 day work week, the 20 more minutes each day is 100 minutes for the 5 days. that's over an hour and a half. So to save $ 3.99 per tank of gas in terms of fuel economy I waste an hour and a half more of my life each week sitting in traffic. I make a little more than $ 3.99 an hour. The solution is for everyone to keep moving and rarely, if ever hit their brakes or stop. It takes way more gas/energy to get your vehicle moving from a complete stop. So the community I live in, the DOT needs to synchronize lights to keep all of us moving, Every driver needs to pay attention and go when it's their turn. And everyone has to use their lanes efficiently. When we all leave plenty of room between cars, those who need to switch lanes can and then make their right turns. I don't mind someone getting in front of me, but when they do, they need to keep moving, not run up the next guys bumper and brake/stop. Traffic is just spastic when we're all in the great cattle drive to work. And what really irritates me is the 2nd, 3rd and 4th cars to make left turns after the light has turned red on them. And then there's others are in the middle of the intersection blocking it because they got caught in between. Every day, people use the same tolls too, have their money ready ! They know how much it is too ! Try planning their trip in advance and being responsible for it, for a change. When many people do it, it effects all of us.
And another point, the fact that a gallon of gas has gone up over $ 1/gallon, that's $ 20+ per tank, there's no way I can make up that difference no matter how easy I accelerate and drive, the $ 4 that I conserve, I'm already in such a deficit from the price of a gallon of gas. Again the solution is to not stop on the highway I use to commute to work everyday. That way I don't wear out my front suspension from the nose dive every vehicle makes in the physics of stopping, that and wearing out the brake pads required to stop.