This is aimed to be the best fuel economy guide for 1gen trucks out there. please post which catagory your vehicle falls in and your average mileage. please dont post your best ever numbers, this is general averages.
catagories;
Truck Avg MPG
1. 89-91 D250/350 single wheel manual trans 17-18
1a. 89-91 D250/350 single wheel auto trans
2. 89-91 D350 Dually manual
2a. 89-91 D350 Dually auto
3. 89-91 W250/350 single wheel manual 17-18
3a. 89-91 W250/350 single wheel auto 18-19
4. 89-91 W350 dually manual
4a. 89-91 W350 dually auto
5. 91.5-93 D250/350 single wheel manual trans 18-19
5a. 91.5-93 D250/350 single wheel auto trans 17-20
6. 91.5-93 D350 Dually manual 18- 19
6a. 91.5-93 D350 Dually auto 17-18
7. 91.5-93 W250/350 single wheel manual 15-17-22
7a. 91.5-93 W250/350 single wheel auto 17-18
8. 91.5-93 W350 dually manual 16-17
8a. 91.5-93 W350 dually auto 18-20