Comment your truck, sleeper size or day cab, motor, hp, transmission, rears, tire size, wheelbase, what you pull and the overall weight of load and truck, speed and rpm, and what mpg you get.
89 378 daycab with tag axle 3406B 425ish 18918B 46k 4.11/5.29 11 24.5 RGN Max 140k gross Fast as I can - 1500 to 2100 IFTA 4.8 to 5.1 Edit to add: Pto use for RGN (wet kit) About 40% empty miles. Majority of loaded miles around 113,000.
3406e (1LW) 94 t600 midroof (60ish inch sleeper), 13 spd, 3.36 rears, 22.5 tall rubber, flatbed, 10-49k lb, 485 hp, speed 68ish, running close to 1400 rpm roughly 5.5-6.5 mpg depending on load weight, height, terrain Wheelbase 285 Truck 2 3406e (6ts) 98 t800 aerodyne lowroof, sleeper roughly 30inch., 9 spd, 3.73 rears, 22.5 short rubber, flatbed, 10-51k lb, 450 hp listed (not confirmed, guessing its actually only 400hp), speed 65ish, running 1600 rpm roughly 6.5-8 mpg depending on load weight, height, terrain, Wheelbase 240ish
1998 FLD120 Series 60 12.7 485HP 3.36 rears 10 speed (hate it but 13’s are $$$) Pulling sandbox in oilfield. Lots of short trips, hills, backroads OH, WV, PA, idiling. That said, RPM is inconsistent. Grossing 75-76K 5-5.5 Edit: 48 inch flat top with a really sweet roof fairing
1998 pete 379. 3406e 5ek. 18 speed. 3.90 rears. 70 inch sleeper. 11r22.5 tires. 38-20 hopper train. 105,500 ish. 75 mph 1700 rpm. 3.6- 4 mpg. 550 hp.
96 w900 day cab, pulling a bucket, 46k 4.33 rears w/15 over, 1124.5, ~100k one way, empty the other, 5.8, I get about the same with the n14 3.55/18 22.5 on the same run
T800 with 3.70’s and tall 24’s running 105k gross in the PNW with a flatbed I was low 5’s consistently.
579 with a paccrap MX13 @455 3.28 gears 13 speed 232 wheel base 70 inch sleeper 22.5 tires 75/1410 rpm I pull buckets so i am never under at least 79K usually pretty close to 80K and i haul nationwide so everything from VA down to FL across to UT. ifta was 6.9MPG last year.
‘99 FL60 3126B baby Cat. 6speed Spicer. 3.90 Rockwell 11r22.5. 33,000 gvw. 75 mph on the 2400 rpm governor all day pushing wind. 7.2 mpg. Idled probably 6 hrs a day total most days at p&d’s. ‘73 Pete 352-110 PaceMaker. 1693 380 hp. 2100 rpm. RTO12513. 4.11 Rockwells. 10-22 rubber. 4.5 mpg no matter what. ‘67 Pete 351. NTC350-855. RTO12513. 4.11 Rockwells. 11r24.5 rubber. 2100 rpm. 7.4 mpg. Bobtail 8.2 mpg.
Remember my old man saying he was getting around the mid 4's with a 475 hp C-15. T-800 tridrive, 18 speed, 4.33 rears, 24.5 tires. About 120k lb gross.
