Most air fresheners are a combo of toxic chemicals that trick your senses. I recently started using perfume or cologne. Some is very expensive but there are some that are $30 or less. The nice thing about it, is that they are made of natural ingredients and a bottle can last years if kept cool and out of light. The smell diminishes fairly quick, but is still noticeable up to four days after a spray. I don't really care about the fragrance longevity anyway, a quick spritz before a drive and I'm fine, it's a much more interesting scent than any single use freshener, and I can use the fragrance on myself as well. I was lucky enough to find the officially licensed Ford Mustang cologne at Wal-mart for $30, maybe your car has its own cologne, I know there are a couple for Hummer, Ferrari, and Lamborghini.