Where can I hang this in my car?

Mount it from your rearview mirror using the integral hanging loop, or position it near dashboard air vents for steady scent distribution. Test placement before driving to ensure it doesn't obstruct your view.

How long does the 90G can last?

Gel fresheners typically provide steady scent for several weeks depending on cabin temperature and ventilation. Hotter conditions and higher AC airflow will accelerate fragrance release.

Can I refill this or is it single-use?

This is a complete gel unit designed as single-use. Once the scent fades, replace it with a fresh can rather than attempting to refill the same container.