headers tune/MPG
#16
Launching!
iTrader: (1)
Join Date: Jun 2009
Location: Washington DC/NoVa
Posts: 205
Likes: 0
Received 0 Likes
on
0 Posts
This may seem too simple, but I suspect that some of your results are because of the expanded use of ethanol enriched fuel and then possibly the winter detergent packages in the gasoline during these months of the year. My mileage drops drastically in the winter, and I have a live tune too. No headers tho
#18
Launching!
iTrader: (1)
I have always had 5.3's with headers never a 6.2 ( i wish) but yes not dyno tuned but tuned by Blackbear with a cable tune .now have AutoCal for the 2010........so he reviews tune after intial install .............. stop and go city driving in both trucks is where my mileage picked up the most after / header exhaust ....... highway 1-2 max I reread your post and see you have 1 3/4 not 1 7/8 headers did you mileage fall off on highway too ? if it did that really is a surprise reduced mileage in city stop and go I have seen that before from too big exhaust especially on a small motor heavy vehicle ......gotta think your tune is off ....... what is rest of your exhaust system ? cats ?