I know two people with TDIs. One of them disabled the EGR. He hasn't had any change in mileage that I'm aware of. I get paid to clean out the other guy's intake manifold. It's not hard to temporarily disable the EGR to test the MPG difference. But you will increase the NOx emissions and get a check engine light.
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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