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My coasting distance is reduced anytime I can hear the tires "singing" on the wet road. The singing noise is produced by the tire tread displacing the water on the road when it makes contact with the road surface and then sucking it back into place as it lifts the tread off the road surface. Air is quicker at filling in the low pressure zone formed when the tread is lifted off the road. If you total up the mass of water on the road that is being displaced away from the tire's contact surface as it sets down and then sucked back into place as the tread lifts, it is considerably much more than the mass of water in the form of raindrops that is being displaced as it strikes the vehicle.
For me, a 83mpg commute on dry roads can turn into 71 mpg commute in moderate to heavy rain, average speed 55mph.
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