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IF the chip increased (advanced) spark timing, and IF the fuel you used (or added water/ethanol injection) could handle it without pinging, then a different calibration could improve fuel efficiency. Some cars have knock sensors and will automatically add spark if you're using higher octane fuel (the EPA tests are all run with 98 RON gas -- very good premium).
Personally, unless I knew exactly what these chips did I'd stay away from them. Too great a chance they could damage the engine.
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