Didn't think of checking on the dome light . Standard on all vehicles we've had for 31 years . The 40.3 is likely off up to 4 m.p.g. when calculated (miles / gals.) . Our '18 ACCENT has been off up to 4 m.p.g.. 36 or a bit higher not that shabby . Could be better when weather gets warmer and no winter blend of gas . That usually adds 2 or 3 m.p.g.. over winter drives . Click banner for fills . Keep us updated on gas mileage , etc.. .