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I've got an '87 FJ60 with Weber, headers, DUI dist and desmogged. I get around 13 around town and 17-18 on the highway. I've also installed some 31X10.5R15 T/A Radials. Just going to the larger tires gave me an extra MPG. I did have to figure out what the new distance travel was for the odometer though.
I had an '84 FJ60 that never got over 13 on the highway no matter what I added to the 2F.
I keep track of my mileage for every tank. I always fill up the tank and then reset the trip odometer. Then I multiply my correction for the larger tires to the miles (I use 1.1) then I divide the miles driven to the gallons I've just put in. Keeping track of the mileage on every tank has help me diagnose problems quickly.