not sure if this is the right section of the forum, if not i am sorry.

is anyone running any alt. fuel such as fryer oil, bio, etc. in the new 6.7s? please post results if so.

 

Read your owners manual, says only 5% Bio Diesel can be used. I have heard of a couple people running 10% Bio Diesel. I have never seen any place that sells Bio Diesel or blends for that matter.

 

Cummins gave their blessing to run B20, but Dodge still only condones B5 or lower unless it’s a fleet or government vehicle. I've been running B20 (BioWillie) for the past 500-600 miles and haven’t had any problems . I have seen a 1.0-1.5 increase in MPG using B20. I only have 3200 mile on the truck so it’s too early to tell if it's the fuel or engine "breaking-in". I found a place close to my work selling B5 so I plan on switching to B5 in the near future just to save myself from a potential warranty issue.

 

Here is the whole section below from Cummins about using Bio. Dodge only approved 5% Bio because a lot of Bio has to much water in it to be stripped out by our fuel filters.
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A maximum blend of 5% biodiesel (B5) is acceptable as long as the biodiesel mixture meets ASTM specification D-975, D-975 - grade S-15, and ASTM D6751. A biodiesel fuel blend that is higher than 5% is not acceptable without additional fuel processing because these higher percentage biodiesel blends contain excess amounts of moisture which exceed the water stripping capability of the on-engine final fuel filter. Should a higher percentage biodiesel fuels be used an auxiliary water stripping filter will be required.

A maximum blend of 20% biodiesel (B20) can be used by government, military, and commercial fleets who equip their vehicle(s) with an optional water separator, and adhere to the guidelines in the Department of Defense specification A-A-59693 (in addition to: ASTM specification D-975, D-975 - grade S-15 and ASTM D6751)