The Hidden Cost of Living in Hawaii: Keeping Your Car Legal Costs More
Everyone warns you about gas prices in Hawaii. Almost nobody warns you about the paperwork that follows. Gas: Among the Highest in the Nation In late September 2026, regular unleaded averaged about $5.57 a gallon statewide , the second-highest average in the country behind California. On the Big Island, Hilo drivers were paying around $5.72 . Neighbor islands generally run a little higher than O'ahu, with Kauai at the top of the list. Fill up 40 gallons a month and you're looking at roughly $225 a month , or about $2,700 a year , on gas alone. Prices have been climbing on global oil market uncertainty, so budget with some cushion. The Costs People Miss Gas is only the beginning. Here's what catches newcomers off guard: Weight tax: Hawaii charges a state weight tax plus a county weight tax, and the county rate varies a lot. On O'ahu, renewing registration on a 3,500-pound car runs about $390 a year . On the Big Island, where the county rate is much lower, the sa...