1999-4Runner-SR5-V6: Washer fluild light on

you're getting about 14 miles to the gallon on a V6 ? [assuming a 65 liter tank = 14 gallons] I'd be a quite concerned, and take it in for a head compression test, and possibly dragging brakes but you should be smelling them cooking. the ww/washer, sensor is at the bottom of the tank, maybe a corroded, broken, or loose wire to the sensor If the wire is disconnected, the light is on. Test the wire is good by connecting it to ground thru a light bulb, like the dome light, light should go out. Just a matter of tracking it down.