His car got 463 MPG and ran on fumes

Categories: Mobility

John Weston’s Air/Vapor Flow System, AVFS

Literally running on vapor!
-over 900 mpg on Coleman camping fuel, or white gas

(see 918 mpg below)

John Weston stands next to his 1992 Geo Storm GSI, which is equipped with his invention dubbed the Air Vapor Flow System. He claims the car can run 14 miles on 4 ounces of fuel, which means it runs with extreme fuel efficiency at more than 400 miles per gallon.

The Geo Storm was a sport compact car manufactured by Isuzu and sold in the United States by General Motors from 1990 through 1993 as part of GM’s Geo line of inexpensive automobiles. The same vehicles, with minor variations, were sold in Canada in the 1992 & 1993 model years only. The Storm was intended to be a budget car with the look and feel of a sports car. The GSi version from these years … included a larger 1.8 L 140 hp engine. Autoweek’s 1990 review of the storm was titled “Slick, Quick And Inexpensive”.

John Weston: “Since I changed the fuel system unit, it’s drastically different. I disconnected the fuel line from the injector so no liquid goes to the engine,” said Weston. Weston showed local TV station NBC-2 a version of his air vapor flow system where instead of liquid fuel, only vapors go to the engine. “They used to say, ‘Hey I’m running on empty' or 'I’m running on fumes.’ Well, this is actually running on fumes,” he said. Weston says the system burns cleaner and also made a bold claim about fuel efficiency from a one-time test. “It came up to 463 miles a gallon if we had driven in the same manner – a gallon,” said Weston. “I drove from here to Fort Myers, and I’m up there keeping up with traffic running 80 mph. ” Now, the backyard mechanic is looking for investors so he can eventually take his invention public. In the meantime, he says you might see his car on the highway.” He also put his vaporizer on a generator, a riding lawnmower, and his motorcycle. (see photos below) 

John Weston and his 400 mpg Geo Storm with his AVFS

By Ovidiu on July 17th, 2008:
The NBC reporters were taken on a test drive where the engine stumbled a little bit and John said he put too much vapor on the pipe, so when he lowered the vapors, everything got back to normal.

“I learned that when using the AVFS [Air & Vapor Flow System] on my Geo Storm by using the standard 87 octane gasoline, then 89 octane, then used Coleman fuel(for lanterns), then charcoal lighter fluid and even rubbing alcohol, each of the different fuels had a different air/vapor mixture setting for the engine to run smoothly.  While idling, and during acceleration, the mixture for fuel had to be compensated for." "I did NOT change timing or bypass any of the original sensors that are factory installed on our vehicles now-a-days.” – John Weston

“Based on talks with actual engineers that work at Ford and GM, these two companies have actively discouraged any improvements in fuel efficiencies. Engineers would be threatened if they were caught tinkering with the computer systems or searching for ways to make the car engines run more efficiently.” It is common knowledge among amateur car fanatics that the car computer systems are programmed to deliver 15% less fuel efficiency than is possible by enriching the gas mixture beyond what is actually needed.

posted by kbcjedi on July 6, 2008 at 11:42 am

Here's a DIY page they share:   run your car on vapors

Under the hood of John’s extremely fuel efficient car

Notice the white container with about a half inch of gasoline in the bottom and an extra pipe with a valve to allow him to adjust the amount of extra air (to control the air/vapor mixture).

It can also be seen the the air filter was in the area now occupied by his vapor system. Running without an air filter may be o.k. for a while – certainly long enough to do a few test drives and measure the rate of fuel consumption, but in the long run, an air filter will be needed. (see our “Run Your Car On Vapors” page)

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