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This guy figured out how to make a old V8 engine get 41 mpg. He put a small lawnmower carburator on it and added a valve AFTER it in vacuum tube to keep air to fuel mixture normal.

He specialties that the higher vacuum caused by the restricted smaller carb throat makes the gas get completely atomized but the extra air added by the valve in the vacuum line keeps the mixture from being too lean.

So this system ensures all gas is atomized and thus gives better mpg.

He says it's like a vapor carburater but has better throttle response.

Now it DOES reduce top engine max power on the Dyno as he shows in a later video but you actually usually don't need as much power as many of these old v8s have on old cars to go down the road at 60 or 65 unless you're trying to tow some heavy thing.

So what you're really doing is allowing these older cars to be financially affordable to use from a gas standpoint.

So unless you're planning on using your old V8 to tow heavy objects or you're really worried about your 0 to 60 time then this is a really good solution to keep your old vehicle on the road and get much higher gas mileage so you can use it on long trips and stuff.

I can see how this would be really helpful if you had an older van that you didn't want to give up with a nice V8 engine but you just couldn't afford the 8 miles per gallon that the old carburetor gave you or the 15 mi per gallon that the rudimentary early fuel injection gave you.