I've deleted my original post, here's my current set up.
Engine: Modified 4.6 DOHC
City MPG: 13.3-17.1
Highway MPG: 18.2-24.4
Typical mixed mileage: 14.2-16.0, I like to drive the wheels off of it on my days off.
Fuel Used: 91 Octane, Usually from Chevron, Shell, and on rare occasion ARCO (BP)
Average highway speed: 65 - 85.
Average Climate: Hot, Hot, 2 weeks of nice, Cold, 2 weeks of nice, Hot, Hot, repeat
Mechanical Mods: All listed in my 97 Alpine green photo gallery
Milage on the engine: approx 2500 currently.
Milage on chassis:140,500 miles
Rear axle: 8.8 trac-lok 3.27
Average commute: 44 miles round trip for work each day, 4 days a week.
Comments: Not bad, I've considered stepping up to 3.73's though I'm not sure I'll be able to afford driving it around just for fun on my days off if I step up. All mpg calculated for me via scan gauge 2.
-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
Amber_Murder's Daily Driver.
-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
Chris_Murder's Daily Driver.