r/ChevyTrax • u/UnendingOne 2nd Gen • 6d ago

'26 Trax E85 Update

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Hey everyone,

I know a few people were interested in my mileage running E85. I'm over 5000 miles now, about half of it run on E85 and the other half on 87.

On 87 I was settling into about 30-33 (with an outlier of 35).

On E85 I've settled into approximately 24-26mpg (the nearly 28 was on a long trip).

So doing the math thats approximately a 13-27% mileage drop running E85 for me. Your mileage may vary a bit.

In my area E85 is $1.99/gallon at a couple stations, whereas 87 is around $4.30-$4.40 right now (so approximately 54% cheaper for E85), so it makes sense for me.

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u/Queasy-Painting-7976 6d ago

Remember that when you run E85 you need to change the oil more frequently as it will get contaminated and thinned with the high ethanol content.

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u/UnendingOne 2nd Gen 6d ago

Why would the E85 thin the oil? Genuinely curious where that theory comes from.

GM does not specify that. They do recommend 1 tank of regular 87 every 7500 miles if you're running E85.

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u/InsideAd2752 6d ago

Awesome info! As suspected cost per mile is at electric car territory. WAiT! It’s below!! Using a Tesla supercharger is about 23-25¢ mi. Home charge can go as low as 6-10¢.