Chrysler did not make an Imperial in 1978. However, the Chrysler New Yorker Brougham equipped with the 440 4bbl Lean Burn engine and standard rear axle ratio (I can't remember what the ratio was/is) was EPA rated at 10 city / 16 highway.
The Gas mileage for this car is 14 in city 21 to 22 highway.
A Chrysler 300 get 19 miles per gallon on city roads and 31 miles per gallon on the highway. Combined gas mileage is 23 miles.
15 to 18 mpg
The Dodge Caravan and Chrysler Town and Country have some fantastic gas mileage for 2012. It seems like gas mileage is getting better and better each year.
About 20 mpg. I have a 2004 6 cyl.
I'm getting 24.5 MPG in my 98 Concorde
Check ingine light and your gas mileage get worse.
87=89 octane my car looses gas mileage runs worse when i get gas that has ethonal
Depending on how the car is drivenand which convertible, mileage can vary. But, according to Chrysler, this car should get 20 mpg in the city and around 27 on highway.
I don't know, but if you can figure it out, sell the secret.
I own a 1978 280Z and get 6 to 8 MPG, of course maybe the 383ci 465HP v8 might be the reason........
I would go with a quart to six gallons.