The blanket warms but does not heat to the extent that you get uncomfortable. One blanket adequately covers both driver and passenger from door to door. Just place the longer part across the seat. We are very satisified with the purchase of our two blankets from Overstock. So much so, that we have since ordered two more as Christmas gifts. While our car is equipped with heated seats, our knees and legs need extra warmth during the cold winter season in Michigan - there is a reason Michigan is shaped like a mitten! My wife and I just used one blanket and we were as snug as two bugs in a rug! However, if you want to be wrapped in the blanket then one blanket per person would be needed. If you have another place to plug a second blanket in your vehicle you could use two blankets. Great blanket to cover our grandchildren in the back seat or when one person needs more heat than another with no hassles about the heater settings. My recommendation: Cuddle up and chill out with these blankets!