You really need to do a tank brim to brim test to be accurate, unless you have a fuel computer, going by the fuel gauge is notoriously unreliable. You consumption will vary wildly depending on your driving style and sort of journeys. Your figure of less than 25 mpg is highly unlikely unless you have black smoke pouring from the exhaust or the engine is running stone cold.
Edited by Peter.N. on 12/11/2011 at 23:12
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