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Maybe this will help....
I drive a Honda Insight, and for the past few months the HV battery is starting to get finicky, so I don't trickle charge it much.
When the HV battery voltage gets low, the ICE engine idle goes from a normal 1000 rpm, to about 1200 rpm or so.
The effect on gas consumption at idle?
FCU display stays maxed out at 150 mpg until I reach a coast down speed of 20 mph when idling at 1000 rpm.
FCU display stays maxed out at 150 mpg until 22 mpg when idling at 1200 rpm.
That's a difference of 10% in fuel consumption at idle.
The consumption at load is much higher than this, so the result of idling at 1200 rpm is pretty small in the grand scheme of things.
Jim.
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