My late 82 D150 longbed, 225, 833OD, 3:55 rear, single barrel carb, 235-70-15 tires, electronic ignition from a Volare (junked the lean burn) would run 20-21 on the highway (65 mph) and 16-17 around town.
Good Luck
Todd

My 1982 D-150 (longbed) with leanburn, 225 slant six, Holley 1945, TF727, and 3.25 gears out back gets about 10 MPG on the highway. In the city it gets about 8 MPG. This is why I don't drive it much.

But it is very responsive and tops out at about 90. I run 50 with it most of the time to save gas.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

I finally got around to checking my mileage this weekend. I calculated 18 MPG. My first thought was that there must be something wrong with the odometer.

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The Old Goat '83 D150 225-2

AKA Ice Titan

I'm getting about 7.45 mpg,and I do mostly driving around town (can't go on the highway,it won't top 60 mph )

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Nick

1987 Dodge D-100(225/904) Daily Driver
1979 Dodge Ramcharger (318/727/NP208)(Under Construction)

I scored a decent BBD at the boneyard last week. I am running my first tank of gas since the swap to the BBD and it appears that I am getting over 10 MPG. I am still calculating mileage so I can't say for sure what it is, but it is way better than it used to be.

My '87 D150 w/ 225/904, Offy intake and Holley 4 bbl gets 14-15 mpg, forwards, backwards, uphill, downhill, and a heavy foot. I haven't taken it on an extended highway run yet, but with my foot and keeping up with traffic, those numbers would probably drop.

-S/6

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The "Silver Bullet"
87 Ram D150