Mack MP7 vs E7 350? in Modern Mack Truck General Discussion Posted April 19 Just bought another truck , 2014 small sleeper Mack with mp7 an M drive , still have my 95 small sleeper with E7 350 and 4:17 rears , it is getting 6.7 to 6.8 pulling a flatbed mainly in Ohio . I'm hoping this new truck gets better mpg but bobtailing home empty the gauge seemed to move more than I expected. Is it reasonable to expect to outperform the 95 on fuel economy, or not? If this thing burns more fuel it will probably be finding another home. The 95 has been a very economical truck to operate.