what kind of mpg can i expect from a jabba'd fab vrs?

about the same unless you boot it everywhere.

Ditto, mine is no different during day to day driving. Got 56 mpg back from Jabba, but obviously if you boot it you'll get mid 20's, but then atleast you have the option to keep up with a CTR/Clio 182 then slow down and get much better economy

Lets just say I noticed sod all difference in economy when Jabba'd, infact I'd even go as far to say it went UP when driving with an economic right foot It just seemed to be a better driven car when remapped. God knows how Mike achieves that. Then, when I put 205/40 17s on the economy goes down by about 15%-20% according to my trip computer (normally 62mpg with steels on, I got just over 50mpg today... )