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Old 11-29-2014, 08:48 PM   #253
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Quote:
Originally Posted by rostam View Post
The 150# driver is considered for GVWR only and is not part of the payload (based on F150, etc manuals).


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I'm pretty sure the fuel is though, but it brings up a good point to check each vehicles' manual, since the mfgrs can & do use differing figures for the non-government/EPA/DOT controlled stuff!
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Old 12-03-2014, 10:38 PM   #254
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Hi, question about fuel. I've heard that Ford says to use 87 Octane for most uses and 92 Octane for towing. My owner's manual says it recommends 92 Octane for heavy loads or towing. "Recommends not Requires." What is your experiences and were the earlier models required to use Premium while towing? We just got home from about a 5,000 mile trip and this will be retirement for my famous Lincoln.
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Old 12-04-2014, 08:10 AM   #255
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I never have used premium fuel and typically buy the cheapest at the pump. As far as I can tell I am having no problems. Either here or in other forums some people have suggested to use premium fuel.
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Old 12-04-2014, 11:02 AM   #256
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I read in the 2014 manual Ford doesn't recommend 85 and when out West due to higher altitudes 85 is the standard regular unleaded. Guess you have to pump the mid level or premium when out West.

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Old 12-04-2014, 09:02 PM   #257
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i've used both for towing and found that the higher octane gave better mileage and better performance. at 30 cents a gallon difference it was equal in cost. lately i am seeing from 35 to 50 cents more for premium so i might try a 'custom blend' on my migration north in the spring.
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Old 12-04-2014, 11:54 PM   #258
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I should try the higher octane fuel since I really don't buy that much fuel when towing season arrives. Typically I'll drive 50 to 150 miles a day then stay put for a week or so and at times even longer depending on the area and the park.
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Old 12-05-2014, 12:20 AM   #259
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Hi, my Lincoln has to have Premium so using Regular in my F-150 might save me a few pennies.
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Old 12-05-2014, 01:01 AM   #260
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I read in the 2014 manual Ford doesn't recommend 85 and when out West due to higher altitudes 85 is the standard regular unleaded. Guess you have to pump the mid level or premium when out West.

Kelvin
85 AKI at higher altitude behaves the same as 87 does at lower altitudes. The risk is if you fill up with 85 at altitude and use the same fuel at a lower altitude.
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Old 12-05-2014, 01:27 AM   #261
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The best fuel to use is the lowest AKI that doesn't negatively impact performance (usually due to timing being retarded when detonation is sensed) Your engine doesn't know what AKI the fuel is, it just knows what the effects are.

Modern engine management systems protect the engine, so there is little risk of engine damage as long as you use a fuel that is spec'd by the manufacturer.

Fuel will vary geographically, seasonally, and from what the label on the pump says. That label is a minimum, not exactly what the fuel characteristic is. That is why you will get a wide range of responses to 'what fuel works best for you' questions.

If the timing is being retarded enough to matter by the engine management system, you will have a decrease in hp and mileage. I used mileage as a proxy for both, since it was easy to measure. If the timing was not being retarded enough to matter, then I saw no reason to use a higher AKI fuel.

Note that the timing isn't retarded all the time with a lower AKI fuel. It may only happen 1% of the time, for example, at certain load and throttle settings, and you won't generally notice that.

My last four vehicles (not Ecoboosts) were spec'd for 91, but were stated to be fine from 87 AKI on up. We have good quality fuel where I live. I ran multiple tanks and calculated the fuel consumption precisely, not using the on board gauge. I found that 87 had a slight performance decrease, 89 was fine, and 91 made no difference. So I used 89 for 100,000 km or so, on three of the vehicles, when filling at home. When I travelled, I didn't know the fuel suppliers so I tended to use 91. I found more impact from ethanol content variability than AKI.

On one of the vehicles, which had twin turbos on a 3 litre, 94 made it come alive, although 91 was spec'd. Seems the engine management system could take advantage of the better knock resistance of the fuel, as it was within the map range. The local 94 also had zero ethanol, which I appreciated.

The only way to know for your new truck is to test it. Multiple tanks, various load conditions, see what difference it makes. If you notice it, use a higher AKI fuel. When you get to where you can't tell the difference, you don't need any more AKI. It doesn't have more energy, it isn't better for the engine (given equivalent quantities of detergents, etc). There are so many variables, that the owner's manual will use phrases like 'recommended' instead of 'must'. They can't account for all the variables either, whether it be altitude, engine condition, driver habits, payload or towing load, etc. So they have a minimum, to prevent damage, and soft recommendations that use words like 'may'.

If all of the above seems like too much trouble, just use premium. Or whatever nozzle is closest. But if you want to play with it a little (after it is broken in and loosened up a bit) then it can be interesting to see what fuel is actually required, and you can go from there.

Jeff
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Old 12-05-2014, 09:34 AM   #262
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The Ecoboost, being a turbo engine, high altitudes can be compensated so I guess that is why the manual doesn't recommend 85.

Kelvin
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Old 12-05-2014, 09:51 AM   #263
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Jcl: 3-liter twin-turbo with an aggressive map... Did you have a GTR?

Hopefully with modern engine mgmt systems they are quicker to take advantage of higher octane after a tank of low grade fuel. I know my '01 GTI was very slow to recognize better fuel after it dialed back the power. I've never put anything less than 91 in my '07 Legacy GT wagon so I don't know how long it would punish me for feeding it cheap gas.
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Old 12-05-2014, 08:17 PM   #264
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Jcl: 3-liter twin-turbo with an aggressive map... Did you have a GTR?

Hopefully with modern engine mgmt systems they are quicker to take advantage of higher octane after a tank of low grade fuel. I know my '01 GTI was very slow to recognize better fuel after it dialed back the power. I've never put anything less than 91 in my '07 Legacy GT wagon so I don't know how long it would punish me for feeding it cheap gas.
BMW 535i M Sport, 2007, when it had twin turbos and not the current single 'twin power' turbo. Officially 300 hp, but others were measuring 300 hp at the wheels on calibrated dynos. The change in response was measured in minutes.

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Old 12-06-2014, 07:58 AM   #265
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What is the max payload capacity of a 2015 F150 4x4 Platinum with all options?
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Old 12-06-2014, 09:52 AM   #266
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I have been told by my dealer that my 2015 Platinum SuperCrew 4x4 with 6.5 bed will have 2,070 pounds of payload, and should be delivered around February 6.
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