Speed limits in Gillette vary depending on the type of road and location when using car rentals in Gillette. Within the city limits, the speed limit typically ranges from 25 to 30 mph in residential areas and commercial zones. On highways like Interstate 90, the speed limit usually ranges from 65 to 75 mph. Always obey posted speed limits, as speeding fines and penalties can be significant, and adhering to speed limits ensures safety for yourself and other road users. Search rental cars on KAYAK