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Old 04-29-2020, 04:08 PM   #16 (permalink)
Master EcoModder
Join Date: May 2019
Location: California
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Tahoe 2020 - '08 Chevy Tahoe H
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Originally Posted by redneck View Post
I never said a higher octane number would...

I forgot about them containing lead...

Come to find out they make unleaded race fuel...

This particular one has a high btu. value.

Adding diesel fuel to gasoline will lower the octane number possibly below which the PCM is able to adjust timing for thus decreasing efficiency and increasing pollutants.

Like I said it has everything to do with the additive package. Shell makes a premium gasoline that is sold at the pump called “V power + nitro” that contains an advanced additive package.

I would try the Shell V-power + Nitro.

It’s the least expensive and easiest to purchase.

I have had bad luck with Shell stations giving me 87 octane at the 91 pumps at 4 different locations...this also happen at 3 Arco stations as well..

that is why i fill up only at Chevron or Mobil stations
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