Over the past two weeks I've had some experience with wet roads (some days more than others) and I've seen about a 10% drop in mpg on the days I specifically tracked my mpg for that day. On my commute to work (same route every day) I average in the 65 mpg range at this time of year. Twice last week on wet roads with ALOT of standing water I averaged 58 and 59 mpg (10-11% drop).
In my Prius ANY water dramatically slows the car...certainly much more than I experienced in my 4runner.
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