Another observation today, backed up by data.
on my 2008 Sport MT w/ 2500miles
75F outside
With engine warm
the idle fuel usage is .18gal/hr
under same condition having some ele loads on jacks it up to .24gph
head lights
even parking lights and
HVAC fan
are what I cycled when making this observation.
Recommendation.
If your of the mind to you keep the eng running (when at a light or stopped) and you are between two cars, you could cut the lights off till it looks like it's time to go.
Of course a small savings, but IMHO it all adds up
