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EGR flow can definitely have an impact on FE. I bought a new Buick Regal in 1977 and when I first bought it, it had a flat spot during acceleration and was only getting about 12 mpg. One day I was at the dealership where I bought the car and I told the salesman about the flat spot and that I wanted it fixed, so he took the vacuum line to the egr valve off and stuck an eraser from a mechanical pencil in it and put it back on stopping the vacuum from opening the egr valve. From that time on it didn't have the flat spot and the gas mileage increased to about 15-16 mpg. I haven't tried it on a car since, but when the weather warms up and I get a base line mileage I might try plugging the line on my '88 Escort for a few tanks to see what the results are.
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