Resonator Delete Mod effects Milage?

[nickygym]

I recently removed my resonator and installed a straight pipe instead. Since then, I have noticed my milage drop by about 3mpg. Has any one else had this happen or is it just me? I have been trying to drive efficiently, however I am still getting Aweful milage.

 

[ROH ECHT]

You've been driving it differently so "better to hear it with"!
I can average, long term avg., from 24.5mpg(more play) to 31mpg(trying for mileage) depending on how I drive it. Normally I average 26.5 to 27mpg. It averaged 28.5mpg to 29.5mpg when normally driven and it was K03 and only tuned with an intake and reso delete.

 

[nickygym]

Thad what I thought, but then I tried to drive efficiently and still got bad milage. Good to know that it's just me not the car.

 

[707Stang]

I don't know about with a res delete, mines was like that when I got it, but I was getting around 30 if I tried if not about 26 or so and if was really honey badgering it I would bet around 20-22. I did, however, notice a change when I got rid of my dp and went back to stock.

 

[xatnys360]

Temperatures are falling - that could be a variable in your mpg. Also, does anyone know when the switch occurs from summer- to winter-blend fuel?

 

[R1600Turbo]

I have mine removed as well. 90% of my work commute has the cruise control set at 60mph, plus any in-town errands I have to run, I usually average around 29mpg. 6MT.

 

[ROH ECHT]

Oxygen in the fuel is affected when it cools too.

 

[Bunnspeed]

So when is the switch to winter blend?

As others have said, cooler weather makes a huge difference for a lot of reasons. Denser air = more fuel to add to keep a/f right; longer periods running rich during warmup, etc.

 

[Das Gespenst]

Almost all of the east coast and Midwest has been on winter blend for about a month, the rest of the country is switching as we speak.