Those of you that have had after market turbos that went from a single to twin compound setup did your MPGs stay the same go up or down ? Thinking of stepping up to set of twins would like to know what to expect ?

I am looking at going with a custom MPI 62/71/13 ss over S400 with an 80.

 

My mpg did not change at all. The drivability sure did!

 

If they are sized right (not too big) the mpg is the same for the most part. Towing the milage can actually go up as long as you drive the same. So that means no racing up hills because the egt gauge is pretty much useless now.

 

No racing even if a Ford 6.0 is beside you trying to race. AHHH, that ain't fun. I love to see those trucks blow up trying to carry a heavy load.....Headgaskets go boommmm...