June 29, 2013 09:37PM
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Admin
Registered: 15 years ago
Posts: 944 : Lake Havasu City, Arizona |
After getting the engine back together I put a new muffler on it because of a inch diameter rusted hole in the middle of the bottom it. Took a leisurely drive for a scenic tour of back roads today. I nolticed that my gas mileage seemed to be unusually low. Got to thinking about the last road trip at the end of May where I noticed that my mileage was better than it had been in a while. There seems to be a correlation to having a hole in the muffler and getting about 10-15% better mileage. I wish I had thought of that before I chose the muffler. Might have just tried a glass pack type straight through type. Is there a better "stock" muffler that does not restrict so much that mileage suffers?
Bob in Lake Havasu |
July 01, 2013 12:49PM
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Registered: 15 years ago
Posts: 670 |
July 01, 2013 04:17PM
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Registered: 14 years ago
Posts: 799 : O Porto |
I had the oposite idea, bad exhaust or mufler causes worse mileage, but never had that explained "as if I was very dumb".... |
July 04, 2013 11:40AM
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Registered: 15 years ago
Posts: 202 : Knoxville, TN |
Make sure you're getting accurate mileage readings. A couple of years ago I though I had suddenly started getting really bad mileage and it turned out the real problem was that my odometer gears were falling apart. As I lost teeth off the gears, I got less mileage recorded for each tank purchased which made it look like the mileage was dropping off. I think the OBC mileage was still accurate, but I keep a log and that was what was looking bad. I put in new odometer gears and everything went back to normal.
John |
July 09, 2013 08:48PM
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Registered: 15 years ago
Posts: 1,869 : Amagansett, New York |
This seems odd to me also. Too bad Primaflow went out of bussiness, I liked their pipes, gave great sound and good power at a reasonable price. They also lasted more than a few years! Lets have more feedback on this thread I'm wondering how a leaky exhaust causes worse mileage.... Rick |
July 27, 2013 05:05PM
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Registered: 15 years ago
Posts: 183 |
Hmmm... something's not right. Maybe the muffler is super-restrictive (it would have to be really bad to affect cruising MPG that much). But I think more likely the O2 sensor is dead, and by coincidence it worked better with a holey muffler. |