Over the last 2 weeks my mileage has plummeted. It went from about 25mpg on a round trip to work, down to around 21 mpg. And over the previous week (to work 5 times and back, plus a few errands) my average for the tank dropped from my normal of about 24mpg down to 18! I used to get around 250 miles before dipping to around 1/8 of a tank, now I'm only getting around 180-190. What could cause such a sudden drop like that? I've been through 3 tanks of gas in the last 2 weeks and they've all been super low mpg like this. What gives? The car is running perfect, no funny noises/smoke/fuel smell/leaks/etc
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