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the ONLY way I can get the 450mile per 12 gallon full tank (37.5mpg) is by slip streaming all highway travel. the higher RPM while the engine decides to warm up is frustrating me to no end.
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Idle your car hot, then pull the idle air control wiring harness from the valve. It will stay in that position. I unplugged mine two years ago. The only real side effect is that the engine idles erratically with the A/C on a cold engine.