Look at it this way, though. Over 15,000 miles - about a year's worth of driving - someone who drives the Acadia will use
148 fewer gallons of gas than someone who drives a Yukon. (By the way, all the EPA estimates used in this article are based on new testing procedures that result in lower, but more realistic, mileage figures for all vehicles.)
Now let's look at another car on the list, the Nissan Altima Hybrid. It gets 34 miles per gallon overall compared to 26 miles per gallon for the similar non-hybrid Altima. That's a difference of 8 miles per gallon.
But someone who decides to buy the Altima Hybrid instead of a regular Altima will save just
136 gallons of gas a year. That's still a lot, but not as big of a difference as a mere 3 mpg improvement in a large SUV.