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Good post, great comments. A/C does not significantly affect fuel efficiency. Most cars nowadays get pretty good gas mileage at highway speeds, using less than 20 hp. It's the folks who make jack rabbit starts and cruise at 85 MPH in their Hummers that don't do so well.

An enhanced way of saving money on gas is to use the strategy above coupled with a cash rewards credit card -- American Express offers up to 5 percent rebates on gas purchases.

One other way to 'save' money on gas: Costco. Use your AmEx card, or if you prefer, use cash. As you know, their machines don't accept cash. So, instead of getting ripped by the ATM fee, go inside and buy a Costco cash card. It's free and you can use it immediately in their gas pumps.

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