In a large bowl, mix avocado oil, chili powder, lime juice and garlic powder until evenly distributed.
Toss chicken drumsticks in mixture to evenly coat.
Cover and let marinate for a minimum of 30-60 minutes.
While the chicken is marinating, preheat grill to a medium-high heat (surface temperature of ~450F).
Place chicken on the grill grates, and turn approximately every 5 minutes until chicken temperature reaches 185F, approximately 30-40 minutes depending on size of drumsticks.