Gas Mileage Fun

[hapyspaz]

So as we all know, when we put the bigger tires and lift on we lose gas mileage. So was the case for me as well. I probably lost around 75 miles per tank, so 3 mpg, but this was only on like 1.5 tanks of testing.

My floorboard has been gtting rather warm lately (only knew this cause the g/f was complaining and putting her feet on the dash) and the other day I started hearing a little bit of a cat rattle.

Got in my stainless steel high flow ****** Cats with stainless steel pipes. So far, gas mileage seems to have gone back up 75 miles per tank. So far, Im happy cause my mpg is right back to normal; that, and it sounds a heck of a lot better and runs soooo much smoother.

 

[hyde]

Good deal, truck looks nice

 

[XLdenaliXL]

how are those hi flow cats?? im thinking of doing them on mine... that much mpg??

 

[hapyspaz]

Just filled up yesterday after taking the truck hiking. So this tank should be a better indication of typical driving.

They feel smooth, mine had 130K on them, and were pretty backed up, this could be a chunk of my mpg gain.

 

[AtomicHoe094]

make sure you scrap out your old one

 

[haks310]

The OE cats on the Vortec engines flow much better than on the TBIs. 100K miles would be a good time to change them out on either engine.

 

[clean454]

The OE cats on the Vortec engines flow much better than on the TBIs. 100K miles would be a good time to change them out on either engine.

ha mine made it 180k on the stock cat, whata difference with a high flow..

 

[XLdenaliXL]

yeaa i have 117k on stock cat/ y pipe. i have headers and a dual cat back system... wnna throw on hi flow cats and new y pipe.... anyone know how much this would run me?