Hey All, just took the truck for its first road trip. 1973 fullsize with 35 inch X- Terrains and used max AC the whole way from Fresno to La and back. Includes a steep grade over the Grapevine. I've got a TBI 5.7ltr motor from a 93 Yukon in it with Doug Thorley headers and no EGR, manual trans. My MPG was 12.5 on this trip. Hows that add up for you guys? I could probably do better with milder radial tires. Whats your setup and MPG?