It's definitely ahead 2/3rds in TMO. I'm in a campaign right now and switching from ahead standard to ahead 2/3rds for cruising changed my 'distance to end of fuel' from 3,000nm to 8,000nm. Ahead 1/3rd gives less returns.
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*While troubleshooting a printer at work
Me: "Do you want me to run the copies through again?"
Boss: "Hold on, let me go get the alcohol first.
Me: 
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