Mpg figure with our old Volvo vary depending on many different situation.
That’s not the point. The point is half a tank for 80 miles is not right.
It’s quite common on the 240 fuel leaking out of the hose connected to the tank.
Guess the same on your 144. I would not wait a minute longer to check if that is the case.
Worn carb would warn you with lower engine performance, difficult to start the engine, black smoke out of the exhaust.
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