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Old 06-07-2017, 10:59 AM   #11 (permalink)
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My 155k mi Fuelly.com average on my CMAX is 47.8mpg

Paul

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Old 06-07-2017, 12:34 PM   #12 (permalink)
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Ford XLT Naked - '14 Ford F-150 XLT
90 day: 15.04 mpg (US)

Ford G-4 with Stinger - '14 Ford F-150 4X4 Super Crew XLT
90 day: 19.8 mpg (US)

Ford Stealth G-4 - '14 Ford F-150 4X4 Super Crew XLT
90 day: 17.26 mpg (US)

XLT Towing Keystone 5th wheel trailer - '14 Ford Keystone 5th Wheel XLT
90 day: 9.71 mpg (US)

Trip 2015 C Max Energi - '15 Ford C Max Energi SWP
90 day: 38.2 mpg (US)

Local 120 volt 2015 C-Max Energi - '15 Ford C-Max Energy SEL
90 day: 55.65 mpg (US)

Local 240 volt 2015 C-Max Energi - '15 Ford C Max Energi SLE
90 day: 60.09 mpg (US)
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It is not worth the extra cost. I use a higher grade octane in our Ford F 150 XLT 4x4 3.5 L EcoBoost in preparation to tow our 5th wheel trailer. This is recommended by Ford. Since we have a 36 gallon tank and tend to refill it at the half tank level I will put 91 octane in just to get to 89 octane when the gasoline mixes. When we return we refill with 87 octane.
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Old 06-09-2017, 12:58 PM   #13 (permalink)
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Quote:
Originally Posted by ptjones View Post
Minimum octane for CMAX is 87, max ethanol % is 15 and regular in NM is 86 octane, I use Premium 93-91 octane.

Paul
That's done because lower air density means 86 at altitude is equivalent to 87 at sea level. It's a non-issue.

Quote:
Originally Posted by ptjones View Post
Premium is worth 1-2 mpg for me, not quite worth the extra cost, but I like the extra range I also have 2016 F150XLT SC 4x4 2.7L EB with 23.3 mpg mostly HWY 15k mi., with 36gal tank, I use regular.

Paul
Unless you derived that difference scientifically, it's likely all in your head. The anti-knock agents in higher octane fuels contain less energy, i.e., Premium gas has less energy per gallon than 87. It's not a big difference, but it's there.

You're basically claiming that by burning a more expensive fuel with less energy content, you are getting better gas mileage. Unless your vehicles are adapting their compression ratio to take advantage of the higher octane fuel, which is generally not possible unless they're somehow changing stroke, bore or valve lift/duration to compensate.
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Old 06-10-2017, 03:25 PM   #14 (permalink)
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Quote:
Originally Posted by S Keith View Post
That's done because lower air density means 86 at altitude is equivalent to 87 at sea level. It's a non-issue.



Unless you derived that difference scientifically, it's likely all in your head. The anti-knock agents in higher octane fuels contain less energy, i.e., Premium gas has less energy per gallon than 87. It's not a big difference, but it's there.

You're basically claiming that by burning a more expensive fuel with less energy content, you are getting better gas mileage. Unless your vehicles are adapting their compression ratio to take advantage of the higher octane fuel, which is generally not possible unless they're somehow changing stroke, bore or valve lift/duration to compensate.
I actually did test this with my ScanGaugeII, I monitored Ignition timing and here is Link to fordcmaxhybridforum starting with Post #32 the ECM advances timing for the octane of fuel: Bought Ethanol Free - Page 2 - General Discussion - Ford C-MAX Hybrid Forum
As you can see I gained at least 2+ mpg from going from Regular to Premium and with Octane Booster another 2mpg. Sure is nice having a ScanGaugeII to monitor ICE and HVB functions.

Paul

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