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Do hot ambient temps have a negative effect on FE?
I've recently noticed about an 8mpg drop in my highway fuel economy and immediately thought something was wrong with my car. Without having time to really diagnose what the cause of the problem is, I have not taken any action too figure it I out.
After two weeks of 80-95 degree ambient temps, I hadn't noticed a problem with my coolant temps or IAT.
Today it's only 75 degrees outside and my hwy mpg is back up to nearly 60mpg. I haven't changed anything on the car...
I'm confused because I would've thought that hotter air outside would've been better.
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