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Originally Posted by Old Mechanic
Pulse and glide will improve you mileage, especially if you glide with engine off.
It takes a certain amount of HP to just spin the engine with no load.
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True, but it also takes a certain HP to accelerate.
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Now a lot of diesel vehicles are underpowered compared to most passenger cars. Plenty of torque at low engine speeds but not a lot of HP for acceleration blasts.
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The average new sedan has all of 50% MORE HP than my big old 2.5 ton, 3 ton capacity truck!!
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Another factor is the aerodynamics of your vehicle. Very high CDs will cost you a lot of your energy in wind resistance, especially in a large frontal area high CD truck.
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Actually, the truck seems decently aerodynamic. I notice that on hills where, on my bike (EX250) in a tight tuck under the extended windshield I need to keep on the gas to maintain 50mph, in the truck I accelerate from 45 to 65 while EOC.
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Combine that with transmission gearing that allows lower RPM at highway speeds and the P&G window for better mileage closes considerably.
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exactly. I want to know by how much. From all the answers I've gotten so far, still seems the window could close completely for some vehicles.
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You may find it effective up to a certain speed but after than the benefits will become insignificant.
Bottom line, I would guess the P&G will probably help up to about 45 MPH. After that the aero drag will probably kill any benefit
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Well, if your guess is right, then I don't need to bother.
I never drive faster than 45mph, (except on the downhills, EOC)