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It's interesting you're seeing that kind of difference. When I tested that I didn't really see any significant difference in fuel economy. My drive isn't flat like yours. It's pretty hilly where I live. I'd definitely go with 89 if I saw a 10% increase in fuel economy. Maybe I should run that test again now that I have more miles on my truck.
Keep in mind, I only have 7k miles on it. So my increase may have been normal with a little break in, coinciding with the 89 gas. But, I did see 1.5 to 2 mpg increase with 89 vs 87 gas. I haven't gone down to 87 in about 2 or 3 fill ups. The increase in gas prices has reduced the gap, percent wise, between 87 and 89, so I've been going with 89.
My truck only has 8k miles on it, so not much difference there. I was initially testing this before I had 4k miles on the truck. And I tested the 89 octane first, so the lower miles on a new engine could have skewed my numbers. You've just helped me talk myself into testing this again. Thanks!
One more thing to add. Mine is 4x4 with 3.92 gearing. Not sure if that matters with the 87 vs 89. Maybe there is more advantage to the 89 paired with the 3.92. As they always say... "your results may vary". For me, it's 89 for now unless the prices increase to more than a 10% difference.My truck only has 8k miles on it, so not much difference there. I was initially testing this before I had 4k miles on the truck. And I tested the 89 octane first, so the lower miles on a new engine could have skewed my numbers. You've just helped me talk myself into testing this again. Thanks!
Funny thing about different grades. It is the alcohol they are using to improve the grade.
I tow often in the mountains of Colorado. 8800# trailer and the truck loaded pretty heavy. I have tested different octanes and can tell any difference in power or mileage. Our regular is only 85.
up here so far we do get premium with no ethanal from the shell stations i use it in all my small engines lawn mower etc, as well have never tuned them up yet 5 years on the mower and 4 on the snow blower they start on the first pull.
I worked at a gas station. We had three in-ground tanks, two for regular 87 and one for premium 91. Midgrade was a mix, pumped from both tanks.
its nearly the weekend and I can’t bear the insanity that these forums suggest, for gods sake the humanity !!!!!!
YUP, I ran a HESS gas station when was a teenager. That was when unleaded really started to come in with them absolutely rotten egg cats and such. Yup, 2 tanks that mix. Sometimes I do wonder if the tanker operator dropped the correct fuel in a tank. ALL we ever did was have the driver stick the truck and I would stick the tanks and also have a water chemical checker on the end of the stick so I knew when to call in for tank MX.
Yep, there's no way to possibly know if you're really getting the gas type you're paying for. It's the honor system. I even had to laugh while I was typing that! (Honor.......Today?) Part of the reason I don't argue when people don't see a big difference between 87 and 89 octane.
