Someone gave me these. Will they help me save fuel?
The weather has turned - we've had some cool days & even cooler nights recently (I could see my breath this morning).
Result: 50 MPG is out of reach, driving at the speeds I was in July & August.
Also, I'm wondering if the t-stat may be stuck open. It takes forever to warm up, and never quite seems to get to full operating temp on cool mornings/evenings.