Is it Worth it to Run Flex-Fuel in Your Car?

[@reedmcvay9037]

i have a 2013 impala with a flex fuel 3.6. these cars have 2 tunes. one that runs with standard fuel and one with E85 they both run learning the drivers driving style. The gasoline is test driven and set from the factory but the E85 takes 100 miles of driving to set the driving style. if it tunes from a led foot it will be more responsive and allow more immediate power. if you granny drive, the tune it will learn to cut power and accelerate slow. It does have adaptive learning so if you start lead footing it it will relearn and will pump more fuel and respond quicker. all newer cars have adaptive learning and flex fuel cars have 2 tunes and fuel maps that self configure. Drive how you want it to react and 100 miles later it will retune. Sometimes quicker but its recommended up to 100 miles.

[@daveyt4802]

Supposedly has 105 octane. And cleans the combustion chamber. Bad thing is blow by and oil contamination.

[@mwat22]

Litters / gallon per 100 km or 62 miles is a much better measure of fuel mileage or economy as it measures how much fuel you need to cover a certain distance whether its up hill or downhill, loaded or unloaded it will apply to every ICE vehicle.

[@crusader8490]

E85 actually made my 2007 Impala a bit faster

[@mrwnking]

My 9th gen impala is an e85, but I've been using regular gas. Idk if my leak from my purge valve has anything to do with it, but i changed the purge valve out, but my engine light was always on. I started to use e85, and the engine light went away so far. Im going to put an oil catch can in, and with the PVC valve, im going to drill them 3 holes to make them a little bigger. Im goi g to start usi g the recommended oil, and the oil filter that chevrolet wants to use on these cars.

[@joshuaraffensperger3592]

Mobil One fully synthetic and a AC/Delco oil filter is what GM recommends as well as running the correct weight of oil that said vehicle calls for due to the VVT. I run Signature Series fully synthetic AMSoil (5w30) in my 2013 Chevy Suburban with a Wix oil filter and I’ve noticed it runs a lot better with no issues.

[@jakedcrane8019]

General Motors made these older cars to purposelly run worse power on E85/ethanol by programming the ECU to retard ignition timing despite being flexfuel vehicle. John Brackett exposed this in pump the movie(2014) by Josh Tickell.

[@csgarage1820]

Interesting. Thanks!

[@rtcturnemup7028]

For this model of impala.. flex fuel only hurts the 5.3 v8. The v6s in this car won’t really be affected unless you constantly refill using e85

[@daveyt4802]

Yeah, how the ignition timing is altered. 🤔What you don't know can ????

[@MarcoGonzalez-bi6cg]

What about 2007 and newer v8 trucks ? Silverado

[@Lyfehurts66]

Is it worth waiting for any gas to damage your engine.. I've talked to many mechanics and they recommend premium fuel.. Good Luck..

[@joshuaraffensperger3592]

Premium fuel? Running the highest grade fuel in a vehicle built to run on regular 87 octane won’t hurt the engine but it won’t produce a better or more favorable result. Doing so will cost you more to fill up but with no benefit to justify the increased cost to fill up.

[@DRod268]

​@@joshuaraffensperger3592so can I put regular in my 2010 Yukon Denali? I thought it was either premium or flex fuel

[@GiveMeYoSammich]

It actually can cause engine problems down the line. If your vehicle is tuned for anything less than premium fuel than that premium fuel won't get burned off like it would in a car tuned for premium. Sure preformance won't be affected but the build up from the unburnt fuel over a long period of time will eventually lead to problems in the engine.

[@nahanng7791]

Can i use 87 instead for this car?

[@michaela_0502]

I run 87 on my flex fuel 2012 equinox. No problems

[@g.cobble4453]

my 08 on E85 average dropped from 25 MPG avg to 17 MPG avg

[@danielmcdaniels295]

I have 08 impala 3.5l v6 and I just looked at the hose from the brake booster to the plenum says LZE but has the plain black gas cap can I still use e85/flex fuel

[@g.cobble4453]

@danielmcdaniels295 look inside of fuel door should have a label if it's flex fuel capable if it hasn't been repaired but most 2008 impala are, but I personally will not run it again. Lost about 6 mpg average.

[@vincentherold2346]

@@danielmcdaniels295I have a 08 3500 non flex fuel. I run e85 with no problems I am tuned on it tho

[@roysmith1355]

Same here in my 07

[@KevinJones-cr6go]

Where the hell do you live , I pay 3.05 a gallon

[@theMister07]

$1.999/gal (e85) at Casey’s Franklin KY

[@olhemi1]

🙂☕👍

[@edwardgomez3633]

Most of the E85 coverage is crap. Just like this one you’ve never used it after putting “this stuff in it”. Pure BS. Don’t pay attention to anyone without experience!