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Gagliano7

Is the 6.6 gas engine Flex Fuel?

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I have been searching and i haven't seen if the new 6.6 is flex fuel. Anyone know for sure. Thanks

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Mine is not. Don't know if they are all that way or not.

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No, the new 6.6L gas engine is not flex fuel. E15 max for that one.

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Ok thanks. I am surprised that got rid of the flex fuel. 

 

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On 8/21/2019 at 6:54 AM, Booger T said:

Mine is not. Don't know if they are all that way or not.

What kind of mileage are you getting with the 6.6?

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9 minutes ago, Gagliano7 said:

Ok thanks. I am surprised that got rid of the flex fuel. 

 

The GM engineer that I saw interviewed said that it "currently" is not flex fuel. They will most likely make a flex version in the future, but right now with a new design they opted to just make sure it ran as designed on 87 gas first.

 

Give it a few years and there will probably be a conversion kit available in the aftermarket once the production engine is E85 capable.

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24 minutes ago, Gagliano7 said:

What kind of mileage are you getting with the 6.6?

While I don't drive it much (it's my wife's truck) what little I have drove it is showing 16-17 highway and around 13 in town and short trips. Slightly better than the 6.0 that she did have. Only have 500 miles on it currently so hoping it may improve some.

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On 8/22/2019 at 9:31 AM, Booger T said:

While I don't drive it much (it's my wife's truck) what little I have drove it is showing 16-17 highway and around 13 in town and short trips. Slightly better than the 6.0 that she did have. Only have 500 miles on it currently so hoping it may improve some.

What year was your 6.0 and gear did it have?  What were you mpg with it in similar situations?  Thanks 

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The 6.0 was and 07 and had 3.73 gears.  It would generally get around 15-16 on the highway and  and maybe 12 around town on a good day.

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