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Yes to both posters. Weather plays a factor and the front mount inter cooler being sandwiched between he radiator and condenser doesn't help much either when you sit and idle in traffic. Doesn't look like I kept up on the comment earlier in the year. The car isn't flex fuel so there is no actual fuel sensor in the fuel line to detect the type of fuel. It goes off how poorly the 87 is doing after you fill up with gas. When you get gas, the car resets to 91 octane map and you get that initial rush from that map leaving the station. Go into rush hour traffic with the A/C on and now you heat soak the inter cooler and MPG suffers till you move enough air through the car moving. 87 os notorious for casing the fuel trim switch by 91 and up can also cause it if the heat is up there.
 
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