Better Gas Mileage From a Filter?

By Seth Bauer

My car is now filter-tipped. Last week, I let Skip Hansen, from a

company named Sabertec, saw the ends off of my car’s tailpipes and clamp

on his $199 product, The Blade. Kind of cool

looking, the device is a filter-lined metal tube that captures

particulate matter (soot) and some of the gases not captured by the

catalytic converter. It also has a side benefit, according to the Blade

team: improved gas mileage.

How this works is a little technical for a layperson like me, but the

basic theory is that the airflow in the exhaust system determines how

quickly and completely the air travels out of the engine. If the mix of

gases in the exhaust changes, the engine’s oxygen sensor will make an

adjustment to the mix of fuel and air going into the engine. In this

case, that change will apparently lead to slightly less fuel and

slightly more air, improving mileage. Sabertec’s research materials say

that the improvement is considerable: “Laboratory testing using the EPA

511 Protocol shows gas mileage increases of as much as 2.7 MPG (CTY),

and 5 MPG (HWY).”

Of course, if that’s the case, why every auto manufacturer hasn’t

figured this out and modified their exhaust systems remains an open


For the next month or two, I’ll be tracking my mileage. At the end of

the year, I’ll report back on it, and on how sooty those filters look.

In the meantime, if any Green Guide readers have tried it, let us know

how it’s going:

Human Journey