Randy, sounds ballpark to me considering the rear ratio you'll have, but if everything is well tuned you might get a wee bit better

and welcome to the garage gg, you'll need to give us a lot more data about that modified 235 that gets better mileage for your 6400 than a 3100 wink

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics