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Message:: [QUOTE="Pedigreed Bulldog, post: 5434894, member: 64805"]The difference lies in the ability to get the turbo wound up to hit the hill with a full head of steam and the engine pulling at its peak performance. If you're in a governed truck, you'll pull the hill better backing off before you get there, and timing your run at the hill so that gravity catches up slightly before you get to your governed speed. If you hit your governed speed, you lose boost as the truck backs out of it...and then your speed drops pretty quickly while you wait for the turbo to wind itself up again. If you hit the bottom of the hill at your governed speed on cruise, your turbo isn't wound up yet...so you lose speed rapidly as you wait for the turbo to build some boost.  And if your peak power is @ 1500 RPM's but you're governed speed happens to be slightly below that? You're not going to be able to hold that gear nearly as long as the ungoverned truck that can actually get to their peak power in top gear fully wound up before they start up the grade. Getting the right start up the hill makes a big difference in how quickly you can get up and over it. The shorter the hill the more you'll notice the difference, because on a 5-6 mile uphill pull the truck is going to end up at whatever speed the gearing allows for the engine's power to pull the weight of the load.[/QUOTE]