OK, now that I have my Duster fresh out of restoration, I am trying to figure out MPG and I am eating gas likes its going out of style! My last two tanks made it 81 miles from full to empty. Not good in my opinion. It is a factory 16 gallon tank. Here are the specs on the motor and the dyno sheets. I am looking at the Air1+2 SCFM column and the avg is 573. I am running a Holley 770 Street Avenger so am I over carbed? Thanks all. - 340 Small Block Blueprinted and Balanced - Forged stock crank - SFI Billet Steel Flywheel - Centerforce D/F clutch - Keith Black 0.030 over cast pistons cut to 9.3CR - Forged rods with ARP Waveloc bolts - Kevko oil pan - Melling HV oil pump - Comp Cams XR286HR-10 Hyd Roller Cam at 105 degree C/L 13 degree @ 050 .544 lift / 286 Duration - Comp Cams Double Roller Timing Chain - Comp Cams 8920-16 retro hyd roller lifters - Comp Cams Double valve springs (140/385 spring pressures) - Hughes 1502 1.5 ratio roller rocker kit with holddowns - Hughes custom built pushrods: 5/16" x .083" 4130 HT 7.900" - Single groove valve stems - Ported J Heads @ 68cc w/ 2.02" intake and 1.60 exhaust valves - Edelbrock 7576 Dual Plane air gap intake - Holley Ultra Street Avenger 770 double Pumper - MSD Pro Billet Distributor - MSD Blaster 2 Coil - MSD 6AL-2 Ignition box
