I was averaging about the same with my stock set-up. It depends on how much $$ you have to spend and how good of shape your motor is in. If you are near time for a tune-up, I would for sure the TFI upgrade (good for up to 14mpg)for your ignition. You can also replace your EGR valve (unless you don't need emissions stuff, then you can look at eliminating the nightmare of vacuum crap under the hood) as they have an anti-ping kit that really is an improvement. I upgraded to the Edelbrock Cam/Intake/and 4v carb and MSD ignition. This is a lot $$ though. I do however, have a lot more power and get a minimum of 12mpg. The next step from there is EFI where guys are seeing 14-18mpg. I guess (if I had to keep emissions) I would start with the EGR kit ($14 I think) then go to the TFI (go to ifsja.org under the tech section) $80. From there you can look at the MSD 6A ignition ($132.00 from Summit), MSD Blaster 2 Coil (28.50 from Summit), Edelbrock Intake (EGR or Non-EGR) ($170.00 from summit) and Carb (240.00 for 1406 600cfm w/ electric choke from Summit), cam/lifter kit approx $120, roller rocker set-up $250.00, and finally EFI for $750 up (depending on if you go with Throttle Body or Tuned Port). I know that's a pretty long answer to a short question, but the point is that your options are limited only by your wallet. You could even look at swapping your 360 for the 258 inline six, add on the 4.0HO heads and TPI and you would be making more horses than a stock 360, lots of torque, and maybe 20+mpg! I hope that helps.