What did you do to your NNBS GMT900 Tahoe/Yukon Today?

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iamdub

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no idea but no codes and I've checked everything basically, fuel trims are good, fuel pressure is good, no misfires, no leaks, nothing has changed but the mpg

Crappy gas? For the past week or so, my work van is suddenly getting 2-3 MPG worse and I've made no changes.
 
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Mine is getting almost 2 mpg better!

Most likely due to the last two fill ups have been with 93 octane and not E85 because of lower prices

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18
 

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