Update on the premise of my original post that BIL claims 20% better mileage while towing with 93, this is based on a 650 mile trip to a new destination, pace was a bit slower than normal following people they were camping with, and observation is based on dash mpg reading. Pretty much a WAG. What's true is that he was seeing low 7s on most previous trips and this trip his dash said 8.6 mpg. He's going to continue using 93.
I have the same truck just in GMC with the same engine, and I see differences between computer mpg and calculated mpg vary from .5 to 1.5 mpg, and the truck is always optimistic. I think the harder it works the closer the dash is to calculated.
I'm curious if anyone who's contributed to this thread with positive results has seen the 20% increase in fuel mileage that he claims? It's one thing if you get a 1.5 mpg bump from 20 to 21.5 but something pretty special if you go from 7.1 to 8.6 mpg. Like going from 25 to 30 just from changing fuel.
I have the same truck just in GMC with the same engine, and I see differences between computer mpg and calculated mpg vary from .5 to 1.5 mpg, and the truck is always optimistic. I think the harder it works the closer the dash is to calculated.
I'm curious if anyone who's contributed to this thread with positive results has seen the 20% increase in fuel mileage that he claims? It's one thing if you get a 1.5 mpg bump from 20 to 21.5 but something pretty special if you go from 7.1 to 8.6 mpg. Like going from 25 to 30 just from changing fuel.