Hi greasess,
I really hate to be a naysayer, but I agree with Old Mechanic's opinion 2 posts ago. Getting it strictly with engine efficiency modifications, no aerodynamic work, and no extreme "hypermiling" driving would be a "trick" I would be VERY surprised to see you manage.
Now, with extreme aero (like boattails, fender skirts, grille blocks/air dams, etc) AND extreme hypermiling (driving below 45 mph, pulse & glide, etc) and getting rid of those 315 wide rear tires & replacing with skinny LRR tires and pumping them up to the max, I would be curious to see if you could hit 50 mpg then, because then I think you'd have a chance.
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