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Yeah, the Matrix/Vibe fuel rail is tucked in close to the engine and has a plastic cover and some foam insulation on top of it and the intake manifold right under it. I took the cover off, and touched the fuel rail about three hours after parking the car one night. It was still pretty warm. I'd be interested in doing testing on the Paseo, but thats one of those things that takes time. There may be small gains to be had, but I doubt there anything huge there. Its also possible that some engines may actually run worse with hot fuel.
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