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In regards to the neutral down hills it might be counter productive. Do you know if your Hyundai has DFCO? If so your mpg
Gauge would read 99.9 mpg
When you let off the gas down hills.
If it does that the injectors shut off when the ecu senses the closed throttle position. That is more efficient than idling in neutral
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Burn lean and prosper \\ //
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