Also, you do not want too low a gear either. I actually get better MPG city with a 3.23 than I did with the 2.41. My current combo is somewhere around 2-3 mpg city better than it was with the 3.8 V6, but worse on the highway. This is because a heavy car needs tons of low end torque to move it off the line, but not as much to keep it moving. Improving one area made it a little worse in the other. It's all a juggling act, and you have to choose the best set of components to achieve what you were going for. I got 29-30 mpg hwy on a trip from FL to NY with the V6, but only 14 city. The car was optimized for the highway numbers from GM, but that made it useless in the real world. Now it gets 16-17 city, 23-25 hwy. Still not as good as the Sentra I am hunting for ( I drive 2500-3000 miles a month), but a better overall compromise.