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Volvo 240 tank holds 60 litres (15.9 USgal, 13.2Imperial) from totally full until the pump sucks air. That's what the owner's book says and that's what it actually does on both our 240's.
Standard tune-up advice: install new spark plugs (NGK BP6ES would be my choice), new air filter, check valve clearances. If valve clearances are greater than .016 and you have an LH-Jet car with the knock sensor, the valve "impacts" due to the excessive clearances can trigger the knock sensor (per Volvo service bulletin), which will hurt fuel economy. Check tire pressures and compare to the door jamb placard or owner's book, and examine the fronts for excessive wear to the outside edges which means you need a wheel alignment. Jack up the front wheels and spin by hand checking for brake drag.
Make sure thermostat is OK - temp gauge should rise to the 9:00 to 9:30 position fairly quickly after startup (and stay there). Slow or low means bad stat = cold engine = poor fuel efficiency.
Cost of checking stuff = $0, cost of plugs, filter and new cam cover gasket = $20 or so.
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Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)
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