I checked with my UltraGauge.
Once warmed up it is about 0.6 l/h in neutral, that would be less than 0.2 gallon per hour. It is somewhat more in D, but knowing that it seldom idles for long in D
2011 Insight Elegance
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Accord horn, Waxoyl, HIDs, Green Oil, UltraGauge, LEDs, full upper&partial lower grille block, aero tweeks, plans for several eco mods