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WAI only really help to warm the car up faster and get you out of enrichment or high idle mode. Past that unless you eoc a lot and need to keep the engine hot because it isn't running long enough to stay warm they really don't give you magic fuel economy numbers on steady-state cruising.
For example my Prius functions as a Prius above 170 degrees coolant temp, but below that the engine won't hardly shut off and it uses a lot higher gpm for accel and idle.
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"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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