Well,
One way to prove Mark wrong is to see if you can drive your car until it gets to about an eigth of a tank. If you get to 1/4th tank and run out of gas, then he is right.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee 
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