E85

[jeffkirk66]

I'd like comments from anybody that has used E85 in a small block V6 GMC pickup.  Does it affect gas mileage and power like some say?

[2017SierraSLT]

Make sure your truck is E85 compatible. 2014 all had it, optional on later years. The yellow fuel cap is a giveaway that it has it.

[2017_whitez71]

I had a 2014 with the 4.3l you could definitely feel the difference in power, but it does hurt your fuel mileage.  About a 20% loss on fuel mileage 

[carnau]

Ethanol has a lower energy content, Flex Fuel Vehilce's using E85 get around 15% to 25% fewer milers per gallon than when using Regular 87 gasoline depending on the ethanol content. 

 

There are a few ways you can test it. If you get a 100ml Graduated Cylinder and fill it with 90ml of the fuel you are using and 10ml of water then shake it. The Ethanol will mix with the water and after a few minutes you whatever the water ML is - the 10ml of water is the actual Ethanol content. 

 

They actually sell a tester on Amazon for 12$ http://amzn.to/2ho81OA

Or you can buy the 100ml Graduated Cylinder for 6$ http://amzn.to/2ywrUK8

 

hit the Thumbs up button if this helps!