Fuel economy or maximum power is only obtainable when the correct air/fuel mixture or ratio (a richer mixture for power and a leaner mixture for economy) is ignited by the ignition system at the ...

Many have to do with the fact that a richer fuel mixture is required when an engine is cold, and even more so when it’s cold outside.

Correct carburetor selection can make the job of fine tuning the air/fuel mixture a easier job, my favorite performance replacement carburetors is the for a mild engine a Quadrajet, Edelbrock ...

Richer Isn't Always Better There are numerous ways to keep engine knock at bay when calibrating an engine for optimum performance. One is to simply run a richer air/fuel ratio. The added fuel does ...

For more power, like passing, accelerating, or moving a heavy load, a richer air/fuel mixture becomes necessary. Under lighter loads, a leaner mixture may suffice and provides improved fuel economy.

There's nothing wrong with grabbing that boxed cake mix to whip up fresh cupcakes in a flash, but there are ways to make them taste much richer.

In the cooler months, gas mileage often decreases in cold weather due to mechanical and environmental factors. Engines require a richer fuel mixture to start and warm up, which consumes more fuel.

In the cooler months, gas mileage often decreases in cold weather due to mechanical and environmental factors. Engines require a richer fuel mixture to start and warm up, which consumes more fuel.