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Hello,
An engine uses a LOT more fuel while it is warming up to it's normal operating temperature. And an engine will always warm up enough to open the thermostat if you drive long enough.
On my car, the temps do not change with the upper grill blocked. The remaining openings are plenty for when I'm moving, and the electric fan still comes on after I'm stuck in traffic sitting still. This is the only time the fan ever comes on -- and it did this before I blocked the upper grill.
The upper grill block and the flush fog light covers I have put on (I need to post a picture of these) have added at least 5mpg.
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