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What's better mpg? C-6 w/ GV OD or a ZF5

2K views 2 replies 3 participants last post by  outsidebear 
ZF5 speed, 3:55 rear ends, stock tires, ATS turbo, I get right at 18.7 MPG doing 100% highway driving at 65-68MPH. With that gearing my tach shows 1950 RPM at 65MPH in 5th over. Fuel mileage was exactly the same before installing turbo. Towing my 3 horse gooseneck, gooseneck flatbed or gooseneck travel trailer I get anywhere from 10 to 13 depending on the load, etc.
 
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