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Just thought I'd bump this topic up.
I took out the grille blocks to do the test (more like tape along the openings) and never put them back on.
This weekend it's supposed to be warm and I'm going to be putting about 400 miles on the car. Not all interstate, either - a lot of it is going to be some pretty hefty hills in the adirondacks.
I took this trip last year when I first got the car and I averaged exactly 40.0 mpg ... that was before I really knew how to drive the 2.0 Duratec and the car wasn't broken in yet.
I plan on putting the outside grille blocks back in (but leaving the center open for some cooling). No doubt my parents will need A/C so that will suck a bit of mileage.
I'm going to put the car in 'engineering mode' so I can get an actual readout on the temp. I'm not sure what the ideal temperature on this car is ... My Jeep is happy around 210.
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