But there's little reason that devices like Speedpass couldn't be used for other routine purchases such as groceries.

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It was also in Chicago that the first Timex-made watches to include a Speedpass were first circulated, apparently to great success.

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ExxonMobil and Timex announced this week that 4, 000 of the watches are available for sale directly from www.speedpass.com and www.timex.com.

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On each watch the Speedpass radio device is integrated into its body.

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ExxonMobil says there are already 6 million Speedpass devices in use in the U.S. and that they represent about 18% of sales at the pump.

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It's faster than a credit card or cash and it works so fast that Chicago-area McDonald's (nyse: MCD - news - people ) burger joints now let customers use their Speedpass to pay for food.

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