How were the gas vapor fuel economy device options tested?

Each option was put through: whether a small engine can run purely on fuel vapors drawn through a canister instead of liquid fuel; comparative fuel economy: engine runtime on a measured one pint of fuel via the vapor setup versus the same measured amount run as straight liquid fuel.

Where can I watch the full test?

The complete hands-on test video is on the original creator's channel: https://www.youtube.com/watch?v=IuGWHfWqWtg

Myth test1 productsMyths & Experiments

Gas Vapor Fuel Economy Device: The Test Results

A head-to-head test of 1 gas vapor fuel economy device options with the measured results for each. See how they ranked and watch the full test video.

The verdict

Ranked first

DIY gas vapor canister

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The measured results

Every number below is read straight from the test. Scroll sideways to see all measurements. Products are listed in the order they finished.

Product	Initial run	Fuel appearance	Comparative test setup	Comparative test result
1DIY gas vapor canister	the engine ran for about an hour and a half using nothing but fuel vapors, drawn through a canister setup instead of liquid fuel	the fuel's color seemed to change to more yellowish after the run, which the narrator speculates could be from oxygenation or air still trapped in the fuel from the bubbling action	engine run for 27.5 minutes on one pint of fuel through the vapor setup, then the same measured amount of fuel was set up to be run straight (liquid) through the engine to compare run time	not stated numerically in the transcript; the narration ends with the overall verdict rather than a specific liquid-fuel runtime figure

How it was tested

whether a small engine can run purely on fuel vapors drawn through a canister instead of liquid fuel
comparative fuel economy: engine runtime on a measured one pint of fuel via the vapor setup versus the same measured amount run as straight liquid fuel

“I was really surprised though that I didn't get that much better fuel economy but as far as claims of saving four hundred to five hundred percent on the fuel I just don't see that happening.”
From the test video verdict.

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