With this in my Duster, (a 318 4bbl Police motor with headers, mopar intake, 340 sixpak cam, 650cfm carb, etc,) I get 12-15mpg, or up to 20mpg on really long freeway trips.
I have a Dual Snorkel air cleaner with a 318 4 barrel pie tin that I am trying to sell with fresh orange paint...
Thought I would mention it, since you are running a single snorkel setup
:cheers:
BTW, 11-13 mpg total tank average with 318 (XE268 cam, headers, Holley 650 DP)+904+3.21s in my Duster. Up to 18-19 at times on the hwy.
The cuda gets roughly the same with a stock 340+727+3.23s
My 2007 Charger R/T Daytona averages a full tank rating of 16-18 and gets as high as 28-30 on the hwy cruising at 65-70. Hwy milage is found when the motor powers down to four cylinders. 5.7 Hemi w headers, cats, flowmasters, Diablo programmer, AFE intake. 4,250 lbs with no passengers and can run 13.5 @ 103. Not too shabby.