Everyone seems to think so. It only shows the power/blowby. If you have a good hill and 60,000 pounds that would do it too. Since most of us don't we use dyno. The Cummins shouldn't have much blow by. A detroit would.
2003 Teton Grand Freedom. 2006 Freightliner Century 120 with Detroit 14L and Ultrashift.2016 Smartcar carry on deck. Full time going from job to job. Building and maintaining plants across the USA. Sold 2006 Mobile Suites 32TK3