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Rambo Jr 06-28-2013 10:00 PM

15.6 MPG on E85 Octane
Hey all just would like to share my recent results with 85 octane fuel. It was my first time filling up with it and seemed to have great results. I drive a 2012 1500 RCSB with the 4.7L which is rated for 10 city/12 highway. Driving 30% city/70% highway I have reached these results. Not too shabby....

davidgcet 06-28-2013 11:00 PM

85 octane or E85? E 85 is 85% ethanol. My wife's SLT gets 7-8 mpg more with E-10 and about 10mpg better than E-85 with pure gas!

Warthog Fixer 07-24-2013 11:57 AM

That's because Gasoline is more powerful cumbustable than Ethanol, or pretty much any other "stable" liquid fuel out there. Which is also why we use it and have such problems going to lesser powered fuels.

snrusnak 07-24-2013 07:43 PM

You're mpg figures are off. The 4.7L ram's are rated at 14city/19hwy. I get 15-18city/20+hwy with intake/exhaust/tune. Stock was same on the hwy and maybe 1mpg worse city.

E85 will typically net worse mpg but more torque.

Warthog Fixer 07-26-2013 01:20 PM


Originally Posted by snrusnak (Post 1158301)
E85 will typically net worse mpg but more torque.

Really? Sounds interesting, I'd like to see some graphs on that. Seriously, as in I'm not being some blow-hard douche'bag! I'd really like to see the info on that, sounds intriguing.

snrusnak 07-26-2013 01:44 PM

Sorry I don't have any. Member transengineer(from this forum - works for the company that makes our trucks) told me that. He gave me a number, I think it was a 6% increase in torque output. Not sure if that's peak or max.

E85 can be great, but most vehicles aren't set up to use it to it's potential. Many race cars are using E85 with great success(with much different compression ratios and octane ratings than our vehicles). E85 has a different stoich A/F ratio as well. I'm not sure how much the stock computers in E85 capable vehicles compensate for all these factors, but I doubt they use the fuel to it's full potential. E85 has an octane rating of 105, typically. That allows higher compression, more ignition timing advance, etc. It's also cleaner, and cooler. When built and tuned for E85 you should be making more power and probably same or better mpg than equivalent with gasoline.

Warthog Fixer 07-29-2013 12:00 PM


Originally Posted by snrusnak (Post 1159835)
...E85 has an octane rating of 105...


SERIOUSLY???!!! No wonder they're using it as racegas!!

82corvette 07-29-2013 07:17 PM

E85 is garbage, don't try running it in cold weather. My experience was bad, didn't even get 8 mpg on my 03 Tahoe flexfuel that gets 18 on regular. The heater didn't work either.

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