Ok so I took the Jeep down to Des Moines the other day (about 100miles round trip). I felt like something was holding it back a bit. The trip down doing 55mph I just barely hit 25mpg. I was looking at the setup for the mechanical fan which is located in the middle. I recently added the center grill block again. Could I be limiting the air flow to the fan enough that it's working harder then normal? I also noticed the gas mileage was slightly better a few MPH faster (more air flow?). I plan on doing some testing this weekend.
Am I crazy thinking this could be the problem?
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Adjusted for my driving habits. 80%city/20%Highway.
20mpg city/30mpg highway or bust! Check out my mods so far
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