The best replacement for gas cost is propane.

The best alternatives to gas cost are rated as following:
★★★★★  propane
★★★★  diesel
★  propane cost
  lp gas cost
  natural gas cost

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Speaking about gas cost, one probably shouldn't forget about mapquest.

Other search terms related to gas cost and their ratings are:
★★★★★ mapquest
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Google Trends

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gas cost
propane
diesel