My other car is a 1996 Buick Park Ave with all the options. It is not bad on gas for a 3800 series. But so it does not ping and get good milage it need to run on Midgrade or premium. It will get 32 Mpg if I use Premium with 4 adults and I keep it under 80. Not bad for a car with 164000 miles on it though. If I use midgrade MPG goes down to 24-26 Highway.