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Old 04-28-2014, 09:33 PM   #1
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Best fuel for the V10

For those of you who have been driving the v10 for awhile, what have you found to be the best gas for traveling? Any thoughts on the ethane blends?
I'm driving without the 5 star tune and want to maximize my mileage and power.

What do you use, and where do you fill up??
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Old 04-28-2014, 11:49 PM   #2
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Use what he owner's manual specs--87 octane with no more than 10% blend, do NOT use the E85 fuel as it can damage your fuel system. E85 fuel is only intended for use in Flex-Fuel vehicles.

During our travels we always try to fuel our coach at Pilot/Flying J stations as most have dedicated islands for RV's. Also if you sign up for their discount card, you get a .03 cent per gallon discount.

When owning a motor home, one shouldn't plan on getting high fuel mileage. Most v10's will average between 6 & 9mpg depending on size, weight, headwinds and driving habits.

I have the 5 Star tune on our 2000 coach increased power somewhat, but not fuel mileage. I was interested in more power and not concerned with fuel mileage when I got the tune. Over 14 years our v10 has averaged 7 mpg.

Good luck and safe travels
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Old 04-29-2014, 05:36 AM   #3
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Thanks! I don't have a vehicle manual, it was nice to see you post the octane it calls for.
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Old 04-29-2014, 12:55 PM   #4
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Our V10 averages 6.5 to 8 mpg, also have the 5 star tune...we try to run 87 octane but sometimes are forced to run 86....x-2 on the Pilot discount, if you have Goodsam you should be able to use that card too.
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Old 04-29-2014, 12:59 PM   #5
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My Ford chassis manual states 87 octane. I don't put in any of that E85 stuff for the same reason Jim stated above. 7.5mpg is about average for us (towing). We keep the mph in that 65-sweet spot for best fuel consumption. If we aren't towing, going downhill with a tailwind, we've gotten above 8mpg.

Oh, & we don't have the 5-star tune.

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Old 04-29-2014, 01:15 PM   #6
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Cheap gas here, bought wherever I can fit, higher octane is of no benefit. 5 Star Tune here, no fuel mileage increase but big drivability improvement due to reduced shifting. 6 something, sometimes 7, MPG towing 5000 lb jeep. Higher than 60 MPH and no 7 MPG. Pentagon Federal Credit Union credit card for 5% discount.
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Old 04-29-2014, 01:30 PM   #7
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While 87 octane is typical for Regular grade fuel, keep in mind if you travel in the higher altitudes of the Rocky Mountains, the gas stations there carry 85 octane as their Regular grade. This is because the high altitude reduces the octane requirements so 85 at high altitudes works the same as 87 at sea level.

Octane is simply the rating of how rapidly the fuel burns. The higher the number, the slower the fuel burns. There is nothing special or better about Premium fuel, it simply burns slower for those engines that require it.
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Old 04-29-2014, 08:21 PM   #8
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Interesting!! When I bought this rig it had a 1/4 tank of old gas...I filled it to 3/4 with a 10% ethanol to freshen it....was that a bad idea??
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Old 04-29-2014, 08:35 PM   #9
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For as long as I can remember I always used Marvel Oil when filling any of my véhicules, my old Winnebago, my cars, now my pickup truck, this fuel treatment works great for me, improved mileage, keeps the fuel line clean, reduce water, and spark plugs last longer.
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Old 04-29-2014, 08:40 PM   #10
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I never had a problem using 87 with 10% ethanol in my V10.
Here in Canada we don't have 85 for higher altitudes.
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Old 04-29-2014, 08:41 PM   #11
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Quote:
Originally Posted by Nuclear View Post
Interesting!! When I bought this rig it had a 1/4 tank of old gas...I filled it to 3/4 with a 10% ethanol to freshen it....was that a bad idea??
Not a bad idea, per se. However, my observation with automobiles, mileage is lower with the 10% blend. Since it's more expensive in Texas, it's a no brainer for me.
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Old 04-29-2014, 08:49 PM   #12
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I get 8.0-8.5 MPG at 60 MPH with my motorhome per the scan gauge. I never verified by multiple tank fills how accurate it is but it does seem pretty close based on single fill ups. 87 octane is all that V10 needs. It is a rather low compression engine per today's standards and im sure timing is not that aggressive either to need higher octane. Have to remember that these engines are hard work engines and designed for constant heavy work and the programming and engine design is based on that. Fuel additives are a complete waste of money. I have spend years working for Ford and a Ford dealership and have yet seen any fuel related issues with the exception of owners putting E85 in their fuel tanks. The PCM is always going to maintain the engineers air/fuel ratio per the calibrations programming. So unless you have some fuel with lower than expected BTU output (aka winter blend fuel) or much higher than expected output, MPG is pretty much going to be based on load, speed, air resistance.
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Old 04-30-2014, 07:26 PM   #13
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Thanks everyone for your advice.
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Old 06-10-2014, 04:09 PM   #14
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I had a V10 in my work truck and the best I ever got was 9 MPG.
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