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Hello,
I do not have a Scangauge -- yet. The coolant did not get too hot -- the electric fan only ever comes on when I'm stuck in traffic. The red warning light never came on.
My mileage has improved with these mods -- so, the answer to your question is the mods save gas; and the car does not overheat. It was nearly 100F yesterday, and all was fine.
Mechanically, the Echo is very similar to the xA (and the xB and the Spectrum). Are the grill openings similar? (Post some pictures.) Try blocking only the top of the grill with one strip of duct tape (and seal the edge of the hood), and see how it goes.
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