Need some help

[mtbiker278]

Looking through the archives I found SVOboy's borrowed equation for calculating the rolling resistance and coefficient of drag, etc. The equation seems fairly simple enough and measuring the decceleration appears to be easy enough, but I still have some issues to resolve.

1) Finding a reliable Cd number for my car!
The civic hybrid has a Cd of .28, but my car is the coupe which has a steeper windshield rake (21 rather than 23) and is shorter by 2 inches. Plus the body panels are quite different so I'm sure that has some affect.

2) Finding the frontal area of my car
I'm not exactly sure what frontal area entails. The front most part of the car? (front bumper, headlights front part of the hood) or something different.

My ultimate goal is to have a giant spread sheet with speed, rolling resistance, drag and whatever other properties (air density, temp, ect) so I can figure out at what general speed my car is the most efficient.

I have a 2006 civic coupe ex auto. Gas mileage numbers are going up slowly as the car breaks in. I'm at around 4.5k miles so far after buying it in Feb.

On a side note, does anyone know what incriments the newer honda ecus modify the fuel map by RPMs. The reason I ask is currently I cruise at 55mph @ 1750rpm, but increasing to 60mph @1950rpm isn't that much higher.

So help would be awesome, thanks!