There are a few EBs here and on classicbroncos. MPG figures from reliable sources are in the high 20s, low 30s. Lots and lots of variables here. Performance + MPG is a touchy subject around here though....:nuke: Seems the most popular EB transmission is the NV4500 because of the good 1st gear and availability of dodge bellhousing adapters. I think there is a guy on here that has a ZF in his. I'm still in the process of sourcing parts, my backup is a ZF + NP205. Ive got a few other options that are more unique (read: difficult and expensive), all of which center on an old 4 speed and various sorts of auxiliary gearing.
Search for a thread called "Lets talk transmissions" and one called "which manual transmission" That should give you the ins and outs of just about every option.
Search for a thread called "Lets talk transmissions" and one called "which manual transmission" That should give you the ins and outs of just about every option.