Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - 2-3mpg with K&N air filter and aftermarket muffler?

redpoint5 · 12-10-2021, 02:32 AM

Doesn't sound like good advice to me. An 18% improvement in fuel economy from an air filter and exhaust? The biggest restriction to airflow in an engine is the throttle, which is used every time it's not wide open. In other words, an air filter isn't going to magic more fuel economy. An exhaust could potentially, but that also needs to be tuned correctly, so some monkey in a shop isn't likely to get that right.

That short trip distance isn't helping economy because it's not enough time to warm up. Get an EV and it will efficiently cover those short distances.

12-10-2021, 02:32 AM	#3 (permalink)
redpoint5 Human Environmentalist Join Date: Aug 2010 Location: Oregon Posts: 12,819 Acura TSX - '06 Acura TSX 90 day: 24.19 mpg (US) Lafawnda - CBR600 - '01 Honda CBR600 F4i 90 day: 47.32 mpg (US) Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base 90 day: 21.82 mpg (US) Chevy ZR-2 - '03 Chevrolet S10 ZR2 90 day: 17.14 mpg (US) Model Y - '24 Tesla Y LR AWD Pacifica Hybrid - '21 Chrysler Pacifica Hybrid 90 day: 43.3 mpg (US) Thanks: 4,327 Thanked 4,480 Times in 3,445 Posts	Doesn't sound like good advice to me. An 18% improvement in fuel economy from an air filter and exhaust? The biggest restriction to airflow in an engine is the throttle, which is used every time it's not wide open. In other words, an air filter isn't going to magic more fuel economy. An exhaust could potentially, but that also needs to be tuned correctly, so some monkey in a shop isn't likely to get that right. That short trip distance isn't helping economy because it's not enough time to warm up. Get an EV and it will efficiently cover those short distances. __________________ Gas and Electric Vehicle Cost of Ownership Calculator Give me absolute safety, or give me death! Last edited by redpoint5; 12-10-2021 at 02:37 AM..