But relative to median household income, gasoline costs are highest in Mississippi, Nevada, and West Virginia. Rhode Island had the lowest traffic fatality rate in the study, at 0.5 deaths per 100 million vehicle miles traveled. Insurance premiums were adjusted relative to each state’s median household income. The estimated current median household income was calculated by adjusting each state’s 2024 median household income from the U.S. Census Bureau’s American Community Survey one-year estimates using growth in the Employment Cost Index for private-industry wages and salaries from the 2024 annual average through the first quarter of 2026. Annual median household income was divided by 52 to express gasoline costs as a share of weekly household income.