The gauge is purposely designed like this in all cars. All cars gas gauge will indicate empty and still have about two gallons left in the tank. Theres two reasons for this, one being the fuel starvation issue mentioned already and the other is to put you into "oh **** I need gas now" mode leaving you plenty of gas to find the nearest gas station. If they didn't leave you that extra 2 gallons of gas once you were on empty there'd be a ton of idiots running out of gas stranded all over the place.
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