Patrick Freeberg (St. Paul, Minnesota) - 1988 Toyota Camry
Patrick’s car has wild gas mileage swings. He gets 30-35 MPG in the summer, but that drops to 10-15 MPG in the winter. He wants to know what's going on. Tom and Ray say some of it is just due to the colder weather, but it's likely that he has a faulty thermostat that’s not allowing the engine to get hot enough.