Bypass the EGR for Better Gas Mileage? And Other Gas Mileage Tips

Back in the day when this bad Boss 429 was roaming the streets, some of the gas saving tips held true, but not anymore.

Back in the day when this bad Boss 429 was roaming the streets, some of the gas saving tips held true, but not anymore.

Your EGR is an integral part of your emission control system. EGR stands for Exhaust Gas Recirculation and it does exactly as the name suggests; recirculates some of your exhaust gas back into the intake manifold, where it mixes with incoming air. This helps lower combustion temperatures and as a result, decreases oxides of nitrogen (NOX) emissions.

Many people believe that plugging the EGR or bypassing it will in some way increase their gas mileage and give them a few more precious horsepower. Can simply bypassing the EGR give you better gas mileage? Can it be that simple?

No, it can’t. In modern engines, you will actually stand a better chance of losing a few percent in the MPG department, rather than making any gains. You really gain nothing by bypassing it. Your car actually does it for you under acceleration, when an EGR block swings into action to prevent it from functioning. So if you have a modern gasoline engine, forget the notion of saving a little bit of precious unleaded by just bypassing your EGR. It doesn’t work.

What about some other easy ways to get better gas mileage you may have heard about? You can always drive slower,but how much fun is that? No, I’m talking about tricks, like the 100mpg carburetor or the magnetic fuel molecule aligner. More to the point I’m talking about things that have been long reported to save gas, but actually don’t.

The first thing on the list is a having a clean air filter. That mileage myth has some basis in fact, but it no longer holds true. In the past, back in the glorious days of Holley double pumpers or Rochester Q-jets, a dirty air filter could cut back on your power and gas mileage. Now however a dirty air filter will still cost you power, but it won’t really hurt your mileage. Why not? Because now days cars are so much smarter. They use electronic engine management systems connected to a host of sensors to meter the fuel, rather than a bunch of venturis, tubes, and holes in some brass. As the air filter gets dirtier and the airflow decreases, the electronics compensate by also decreasing the fuel flow so the air/fuel mixture is always correct. The problem is that you’ll lose plenty of power, so don’t let that filter get too dirty.

Here’s another one; leaving the tailgate down in a pickup will save gas. Actually according to recent tests it doesn’t. The same goes for removing the tailgate entirely and putting a net across the opening. Why dfo you actually get better fuel mileage with the gate up, instead of following conventional wisdom and dropping it? The gate contains a bubble of air called a vortex that actually helps smooth airflow over the bed, reducingdrag and increasing gas mileage.

Still more old timers myths that are supposed to increase your gas mileage, but in most cases, do little or actually have a detrimental effect on it include the “put it in neutral when going down hills” piece of advice. Although this actually works in older cars, it doesn’t in newer vehicles. That’s because in newer vehicles the electronic engine management systems actually shut off the fuel flow entirely when you are moving forward with the throttle plate in the closed position. That is only true when your rig is in gear. When you put it neutral the fuel cut off is not in effect, so you’re burning gas. Keep it in gear, just take your foot off the gas, and your cars ECU will stop feeding your engine for you.

These are just a few things that people just know are true about ways to get better gas mileage; except they really aren’t.

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2 Responses to “Bypass the EGR for Better Gas Mileage? And Other Gas Mileage Tips”

  1. Bypassing egr does work to give to more performance & better gas mileage, average gains are about 25%. The problem is most people just disconnect ‘plug the hose’ that will send a code to your on board computer. Also one thing effect the other so you have do a work around but in the end if you know what your doing you can save tons of money on gas.

  2. Good read. With the current gas prices, it helps to understand these myths about gas savings.

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