BONE STOCK 06 MUSTANG GT 5 SPEED... GOT 95000 ON HER NOW AND OWNED SINCE SHE HAD 4000 MILES... ALWAYS GOT AN AVERAGE OF 21.5.. I DROVE IT FROM FLORIDA TO SAN ANTONIO ONCE.. SET CRUISE ON 75 THE WHOLE WAY THERE AND GOT 25.5 MPG ON THE WAY HOME SET THE CRUISE ON 65 AND GOT 29.8... LAST TRIP I TOOK TO NORTH MISSISSIPPI I WAS EASY ON THE THROTLLE AND USED THE HILLS TO MY ADVANTAGE AND ONLY EXCELERATED WHEN I HAD TOO... GOT 31.7 MPG!!! A 300 HP CAR AINT SUPPOSED TO GET THAT LOL!!!