To me, this sounds somewhat ludicrous. What they're REALLY saying is that regardless of the car, it takes 1 gallon of gas to run the A/C for 100 miles. Period. That's a different percentage of mpgs for each car, and obviously the higher mpgs the car gets, the bigger decline it will be. If they were comparing a Honda Insight, 1 gallon would be closer to a 50% drop!! We all know that this isn't true. So each car does NOT use 1 gallon of gas to run the A/C for 100 miles.

Furthermore, even if it did, a more fuel efficient car would still be more efficient.

Statistics. I hate them, because most people misuse them.