Flex Fuel problem
July 29th, 2014 | 7:09 AM
#21
Administrator
Joined: Apr 2008
Posts: 7,573
Likes: 45
From: Austin, Texas
But sometimes the labeling at stations could lead you to believe that the premium (93 octane) is alcohol free when in reality it is not...
May 6th, 2015 | 1:17 AM
#23
CF Beginner
Joined: May 2015
Posts: 1
Likes: 0
E85
As a mechanic and and a Chevy owner I know all about the E85 battle. E85 is recommend for GM vehicles that have the capability of E85. If you have a "Z" in ur Vin # that vehicle has the E85 capability You can also look on ur fuel door it should have a sticker.
As far witch one is best I have found if u mix it 50\50 in the winter it will help with starting. I do not use E85 when pulling anything and I don't always use E85. When I mix 50\50 I get 18 mpg (2004 Chevy Suburban 5.3L V8) when I use gas with E10 I get 26 mpg. I also put a fuel system cleaner in my gas tank about 1 a month to help keep things from getting gummed up (I do a lot of driving). Also something else that will help your fuel mileage is your spark plugs, air fikter and oil. I ALWAYS us A\C Delco spark plugs (ALWAYS double check the spark plugs for gap) and synthetic oil. I replace spark plugs every 50-75k and I pull the spark plugs out every 20k to clean and re-gap if needed. I replace my air filter ever 20k miles even if it still looks good. My suburban has 155k miles. As long as you keep up on maintenance you should get good mpg. My suburban is my work vehicle I can't afford to have it brake down as I own my own business.
As far witch one is best I have found if u mix it 50\50 in the winter it will help with starting. I do not use E85 when pulling anything and I don't always use E85. When I mix 50\50 I get 18 mpg (2004 Chevy Suburban 5.3L V8) when I use gas with E10 I get 26 mpg. I also put a fuel system cleaner in my gas tank about 1 a month to help keep things from getting gummed up (I do a lot of driving). Also something else that will help your fuel mileage is your spark plugs, air fikter and oil. I ALWAYS us A\C Delco spark plugs (ALWAYS double check the spark plugs for gap) and synthetic oil. I replace spark plugs every 50-75k and I pull the spark plugs out every 20k to clean and re-gap if needed. I replace my air filter ever 20k miles even if it still looks good. My suburban has 155k miles. As long as you keep up on maintenance you should get good mpg. My suburban is my work vehicle I can't afford to have it brake down as I own my own business.
May 6th, 2015 | 8:18 AM
#24
CF Addict
Joined: Feb 2008
Posts: 2,900
Likes: 3
hmmm
As a mechanic and and a Chevy owner I know all about the E85 battle. E85 is recommend for GM vehicles that have the capability of E85. If you have a "Z" in ur Vin # that vehicle has the E85 capability You can also look on ur fuel door it should have a sticker.
As far witch one is best I have found if u mix it 50\50 in the winter it will help with starting. I do not use E85 when pulling anything and I don't always use E85. When I mix 50\50 I get 18 mpg (2004 Chevy Suburban 5.3L V8) when I use gas with E10 I get 26 mpg. I also put a fuel system cleaner in my gas tank about 1 a month to help keep things from getting gummed up (I do a lot of driving). Also something else that will help your fuel mileage is your spark plugs, air fikter and oil. I ALWAYS us A\C Delco spark plugs (ALWAYS double check the spark plugs for gap) and synthetic oil. I replace spark plugs every 50-75k and I pull the spark plugs out every 20k to clean and re-gap if needed. I replace my air filter ever 20k miles even if it still looks good. My suburban has 155k miles. As long as you keep up on maintenance you should get good mpg. My suburban is my work vehicle I can't afford to have it brake down as I own my own business.
As far witch one is best I have found if u mix it 50\50 in the winter it will help with starting. I do not use E85 when pulling anything and I don't always use E85. When I mix 50\50 I get 18 mpg (2004 Chevy Suburban 5.3L V8) when I use gas with E10 I get 26 mpg. I also put a fuel system cleaner in my gas tank about 1 a month to help keep things from getting gummed up (I do a lot of driving). Also something else that will help your fuel mileage is your spark plugs, air fikter and oil. I ALWAYS us A\C Delco spark plugs (ALWAYS double check the spark plugs for gap) and synthetic oil. I replace spark plugs every 50-75k and I pull the spark plugs out every 20k to clean and re-gap if needed. I replace my air filter ever 20k miles even if it still looks good. My suburban has 155k miles. As long as you keep up on maintenance you should get good mpg. My suburban is my work vehicle I can't afford to have it brake down as I own my own business.
Can I ask why do you use E85?
It's more corrosive than gasoline, contains less energy per gallon (so less MPG), and burns a food source.
Have you run the numbers, is it less expensive (to drive) where you are?
I'm looking at cost per 100 miles. 18 MPG even at 50/50, vs. 26... this seems like gas wins. And with gas, I don't have to use a fuel system cleaner... technically I use none of this as I drive a Model S now, but I still hate E85 with such a passion that I follow it...
June 30th, 2017 | 9:31 PM
#26
CF Beginner
Joined: Jun 2017
Posts: 1
Likes: 0
I have a 2007 suburban with flex fuel. My mileage was not that great until I realized a computer board that manages flex fuel was out.
Very expensive part!
I am looking to get an older suburban, but want to get Flex fuel. What year did they start putting flex Fuel in Suburban's?
Very expensive part!
I am looking to get an older suburban, but want to get Flex fuel. What year did they start putting flex Fuel in Suburban's?
January 15th, 2021 | 1:23 PM
#27
CF Beginner
Joined: Jan 2021
Posts: 1
Likes: 0
I have a 2004 GMC Yukon 4x4 with the 5.3 Flex Fuel version I'm getting horrible fuel mileage on 87 octane I did a tune-up with oe plugs and wires changed the 02 sensors with oe sensors did the upper and lower intake gaskets because they were leaking reset the computer took it on the freeway got the green light 20 miles later but within those 20 miles I used 2 gallons of fuel on the freeway!!! I don't know what is going on im also running 265/70/17 stock rims nothing's changed
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