14%mpg loss is actually a pretty low
I know the original post is 2 years old now, but since there aren't many on this topic I am going to reply.
I am driving a 2001 Civic LX and usually get about 33-34 mpg - this in South California where it's usually pretty dry. It's been pouring rain for a couple of days now, and the difference in MPG is monumental - down to about 26-27 (which would mean at least 20% loss). My tires are Pirelli Cinturato P5, all weather.
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