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I made a trip to Iowa from WV in a Cummings powdered Dodge with a egt guage and you could use egt like a vacume guage driving a gas truck. You learn to feather fuel peddal a little and keep speed with less egt and fuel used. We could get 25 mpg on a ton truck by adding a quart of transmission...

Most gain people get is by turning fuel up, more boost psi and trying higher RPM. Exhaust gas temperature gauge is a must since you are turning engine from diesel to blow torch . It does not take long to cook the top out of a piston when turned up. Mack injector pump used to have warning tag...