6.5 whoop whoop!

[snailexpress]

Here is calculation for same truck at different speed.
Air drag formula -
X - is drag force
Cx is Reinolds factor
P - is the air density
V - is the speed
S - is cross sectional area
Coze we have same Cx, P, S for simplicity we can drop them out.
How speed change air drag:
50 mph X= 50x50:2 = 1250
55 mph X= 55x55:2 = 1512
60 mph X= 60x60:2 = 1800
65 mph X= 65x65:2 = 2112
70 mph X= 70x70:2 = 2450
Now let's talk about power you need to overcome air drag force
Here is the formula to calculate:
Sucks speed play here in cube!
50mph P= 1250x50 = 62,500
55mph P= 1512x55 = 83,160
60mph P= 1800x60 = 108,000
65mph P= 2112x65 = 137,280
70mph P= 2450x70 = 171,500
Make sense? Driving just 15mph faster require more then double power to use.
In real life it even worst I don't consider aerodynamics of the truck Cx.