However, projections are notoriously non-predictive. If you had extrapolated the gasoline prices from 10 years ago, you'd expect that we'd be paying $10 a gall

However, projections are notoriously non-predictive. If you had extrapolated the gasoline prices from 10 years ago, you'd expect that we'd be paying $10 a gallon, rather than almost half of what prices were then - even in raw dollars, ignoring inflation.