What is the gas mileage of 86 Volvo 240 dl?

My 86 will average 26 mpg combined city hwy driven normally. When I'm in the high mileage mode (coasting where possible, slow acceleration, low rpm) I can average 28 combined. On a 500 mile road trip (all highway) driving at the speed limit, and drafting big rigs when possible, I averaged 35 mpg.