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How to improve a series 60 detroit. Need more fuel mileage!

Just bought a 2000 freightliner century with a 1999, 12.7 series 60 detroit. Single axle with front lift axle, wide singles, best Michelen tires. 2:79 rears, 10spd direct, air tabs, fleet air filter, pittsburgh power muffler, new dura lite charge air cooler, recent overhead. Average speed 58mph. Hauling tanker with 80,000 one way and empty on the backhaul. Lots of rolling hills and short steep grades. Do the same run almost every day. This truck gets almost exactly 8.7 mpg every day. I have a 1999 freightliner century with identical specs except for a cummins ISM 370hp. When I use this truck it consistently gets 9.6 every time and this engine has over 1.3 million original miles on it. I always hear everybody talking about how great the series 60 is but I can never get the fuel mileage as good as my ISM cummins. I'm considering having Pittsburgh power do the VGT turbo upgrade with their manifold and tuning. Does anyone have any experience with this? I really want to get 10mpg or more any help on getting my Detroit up to 10mpg would be great. I know there are people out there who are breaking 10mpg with their Detroits. Also does anybody have info on the ISM? It's a stock engine except for fleet air filter, pittsburg power muffler and dura lite charge air cooler. Pittsburgh power doesn't have any upgrades or tuning for this engine. Thanks for the help

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,,, throw away your entire camshaft activated injectors, and install a complete. 35,000 pound pressure common rail system, and pump . Probably give you a mile and a half mpg . But it might take a million miles to pay for it .

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Rick will be eternally grateful.
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