Assuming a spherical droplet, 1 droplet of water has a volume = V = 4/3(pi)r^3 = 0.006in^3
At any one time, there are over 100,000 droplets of rain in contact/on your car - it's a dynamic system, so this is a tough estimate. I'd feel comfortable covering a range that includes a factor of 100: 6 to 61 to 613in^3 of water interfacing with the car at all timesSince water weighs 0.036#/in^3 (8.3#/gal):
0.0361#/in^3 * 6 = .2#
0.0361#/in^3 * 61 = 2#
0.0361#/in^3 * 613 = 22# Basically, the weight of the water is neglible (unless your car leaks). Air density and actual water resistance as you approach hydroplaning are the largest factors. In this picture you can see that you are pushing water. 
In order to overcome the resistive force you must apply more gas. More gas for the same "non-water" mph = less mpg. SS
____________________________________________________ 2-19... always remember 2-19... 
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