Yes, there's a major difference between car light and car free. Further there are varying degrees of "car light".

Though my wife and I have debated whether or not to get rid of one of our vehicles we've decided not to for a few reasons. The first being that we'd most likely end up keeping the larger most fuel inefficient one since that can meet all of our family needs. The small car can't though it's plenty sufficient for a good number of them. Having two allows us to use the "cheaper" one unless we need more cargo room.

Still if I were to stick with the basics in terms of cycling costs and forego a lot of the extras I spend money on, we'd probably still save money in the long run even keeping both cars. Our vehicles are pretty old but have low miles thanks in part to my commuting and using the bike for other trips. I don't have to fill up often enough that I worry much about gas prices.