NO!
Of course the fuel economy of your vehicle is going to greatly depend on your driving style so do your comparing under same the conditions.
If a tune is done correctly then fuel economy gains can be considerable but you should never lose.
NO!
Of course the fuel economy of your vehicle is going to greatly depend on your driving style so do your comparing under same the conditions.
If a tune is done correctly then fuel economy gains can be considerable but you should never lose.
Ray McClelland 
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