Went to near Tallahassee from GA. Garmin was adding 80 miles to Maps' route. It kept wanting me to make Uturns on the Google route then basically said "oh yeah" finally and put me on Maps' route. Still 10 miles more than Google Maps. I took the shorter route still truck legal. But hey less truck traffic for me when the steering wheel holders just follow the Garmin blindly.
Another twisted joke is coming south through Louisville KY. Garmin routes you to exit off I-65 South onto 265 then get off at the first exit, get back on 265 in the opposite direction then get back onto I-65 south!