I think there is no problem. Just last week I observed:
50 paces away: Dodge Ram diesel idling
100 paces away: Prius moving ~10 mph
The Prius' tire noise was louder than the idling diesel, at twice the distance. Maybe we should "Bell the Diesels" instead.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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