I would get a programmer and maybe an e-fan

 

I hover between the 15-16 mark.

 

Around town, the 3.55's are worse for mpg than 3.92's because it takes more throttle to get rolling. I drive approx 65% hwy and 35% city on my 72 mile a day round trip to work. I don't drive real easy and it is fairly hilly on the interstate. Running 93 octane fuel with a 93 octane DSP tune with the mds turned off, I averaged 18.6mpg on my last tank doing the math (not the overhead display). My only other mods are a K&N drop-in filter, Airaid MIT pipe and a Magnaflow cat-back. I also have a soft bed cover, but never saw any gain from it either.

Blacksport, you might see a little gain if you removed the power wire. They do richen the fuel mixture a bit.

 

Find a station that has ethanol free gas. You will gain 2 - 2.5 mpg city. It costs more per gallon, but your hemi will love you for it. And so will your wallet when your fuel system stays happy too.

http://pure-gas.org/

 

Not possible, it's 10%+ ethanol around here.

 

Yeah, I actually took it off a couple of days ago and I'll see if that helps, but I thought it only richens the mixture at WOT only?