Yes Sir. I hand calculated every single fill up on every one of those trucks. Still have the logs digitally saved, actually
1999 C2500 eclb 350/80E/4.10
Avg - 12.9
Best - 14.1
1999 K3500 cclb 454/80E/4.10
Avg - 11.3
Best - 14.4 (while towing just under 11k lbs?? I never did figure that one out)
1997 C3500 cclb 350/80E/4.10
Avg - 12.6
Best - 12.6 (only drove it on one tank, engine died)
1996 K2500 eclb 350/NV4500/3.42 (yes, really, it had 3.42s)
Avg - 15.1
Best - 17.1
1999 K2500 Suburban 454/80E/4.10
Avg - 10.9
Best - 11.6 (hoping for a couple more with the rebuild)
Nice info - thanks for sharing!