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Lost 3+ Mpgs

janschutz

Corn Hauler
I have lost over 3 mpgs in the last month. In the past when they switched to winter formula gas, I only lost 1 to 1.5 mpgs, so this is twice that amount. I have a stock A-code 289.
The timing seems spot on, I pulled the plugs, which have only 5K miles on them.
The number 1 plug is the only one that looks different. But they look fine to me, what do y'all think?

SP1.jpg


Went ahead and put a new set in
SP2.jpg


Where should I look next?
 
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