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Old 02-27-2015, 06:45 PM   #29
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2015 F150 HD Payload 5.0L vs F250 6.2L

The computer senses fuel quality with knock sensors and retards timing to prevent pre-detonation(pinging) thus reducing engine performance on Ecoboost.Premium fuel allows for maximum ignition timing advance so more horsepower and torque is achieved.With small displacement engines running twin turbo regular unleaded can be used but premium is much better for the long run.

The 5.0 will perform well except in high altitude thin air where horsepower will suffer 15-30% whereas the Ecoboost turbos are virtually oblivious to the altitude change.The same is true for turbo Diesel engines.
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Old 02-28-2015, 09:37 AM   #30
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The idea that lower octane gasoline is lower quality is dead wrong. It has more btu's per pound than premium You are susposed to use what your engine was designed for.
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Old 02-28-2015, 11:16 AM   #31
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Quote:
Originally Posted by pappy19 View Post
You can also add the Firestone Air Bag system to keep your tail from dragging like this:
Or move all items to the rear of the camper.
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Old 02-28-2015, 04:52 PM   #32
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2015 F150 HD Payload 5.0L vs F250 6.2L

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Originally Posted by tjdonahoe View Post
The idea that lower octane gasoline is lower quality is dead wrong. It has more btu's per pound than premium You are susposed to use what your engine was designed for.

If you have a Ecoboost or other high output small displacement engine you need to read your manual as this engine was designed for maximum performance with premium but will operate with regular with reduced power output.

Premium actually contains less BTU than regular and is designed to burn slower and at higher compression reduce pre-detonation thus allowing for more ignition timing advance and power output.

Burning premium in a normal non turbo or supercharged low compression engine will have no benefit.

So those who choose to burn regular in engines designed for premium are reducing their engine performance ,lowering their mpg and reducing their engine life while pinching pennies.
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