Some people based at CleanMPG.com did an Insight marathon years ago. I'll have to look up what they accomplished but it was well beyond what we did at the GGP. 1000 mile tank? 2000 mile tank maybe? However they had relatively no traffic on a public roads loop, with no need to drive any particular speed at all. I'm sure it can be found if you google for it.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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