does BACK-PRESSURE increase MPG vs straight thru... - Toyota Yaris Forums

GeneW · 05-03-2009, 01:18 AM

Quote:

Originally Posted by marcus

thinking of straight thru muffler but stock pipes..worried about drop in mpg. anyone???????????

I think that you'll derange your system to some degree. As I tried to point out, backpressure seems to matter in terms of chemistry through the catalytic perverter and hence in terms of how the motor runs.

I ran straight pipes on a 75 Chevy Nova for about a year. Reduced the mileage somewhat and I didn't have an ECU that had more computing power than some 1970s vintage fighter jets in it either.

Gene

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Using DFCO to increase your MPG	BailOut	Fuel Economy Forum	216	08-30-2018 04:15 AM
42.04 MPG straight off the lot!	bnther36	General Yaris / Vitz Discussion	25	05-17-2010 06:09 PM
My progression into hypermiling	BailOut	General Yaris / Vitz Discussion	8	10-13-2009 06:31 PM
Help me see 55 mpg!	Loren	Fuel Economy Forum	76	04-02-2009 04:23 PM
To accurately measure MPG when should I fill back up.	mgthompson	General Yaris / Vitz Discussion	17	03-30-2007 10:07 PM