I guess it depends on what kind of driving you do (sitting in traffic jams, for instance) but I'd be surprised if you couldn't beat those numbers just with some of the hypermiling tips on this site. I wouldn't have believed it myself, but just by changing my driving style I'm getting an extra 150 miles out of a tank of gas.
I also suppose it depends on what kind of gas you use...I am not sure what you have in Cambodia. If the ethanol is higher, the numbers will be lower.
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