smokey_mountain
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- Joined
- Sep 22, 2019
- Posts
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Gas is heavily blended now with ethanol up to the max limit possible. Ethanol-rich fuel cuts mileage dramatically. Try Costco fuel, it is cheap for a reason (and not it is not because it is a loss leader). I have measured with an app, 3-4MPG between Costco and Exxon on two different vehicles,So this past weekend, we had a little 300 mile trip planned and had 3/4 of a tank. Filled it up with Wawa (convenience chain in the northeast) 91 octane. I got 17 MPGs on the way out. Pretty horrible since we went on a 1700 mile road trip and I average above 20. Decided to fill up with Exxon 93, and the Yukon was much happier. Instantly the on board computer read we were at 21 MPG at 75 MPH. Maybe it was a bad batch of gas or something else. Any other thoughts on that?
Tahoe being more sensitive to Fuel brand.