Cheapest gas I've ever seen was 89¢ a gallon and I was in a car seat. Cheapest I ever bought was $1.99 when the market crashed in '08.
But back to the topic, because people don't want them. But designers are compromising, notice the rear hatches on new suv's? Also, truck tail gates have a small extension on them now. On a side note, the new '13 ram will have start/stop among other goodies, possible mid 20's combined score.
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