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Well, my girlfriend drives the Prizm, and I don't think she cares as much about gas mileage, so I installed the auto meter vacuum gauge on my 2003 Nissan Frontier. It's a 4 cylinder 5 speed, and I've been getting about 22-23 on the freeway. I'll log the mileage for the next couple of tanks and see how much it helps. It's surprising how a little lift of the throttle brings up the vacuum without decreasing speed much. Helps you monitor how steady you hold the pedal as well. Probably will help if only because it almost makes you feel guilty giving it too much gas, the needle goes towards the red part of the dial haha!
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