Well I have fixed any concerns i had about the fuel consumption of my boosted JZA70.
The fitment of a locked diff now means I measure the cost of running the car in terms of TYRE CONSUMPTION and no longer fuel consumption.
The most fun modification i have ever made, turned my lazy limo'd cruiser into a vicious burnout king / dorifto weapon !
Honestly though, with some track days coming up I decided to give a CIG locker a go to see how bad it could be. Its not nearly as bad as i thought, even in the wet, and has actually made the car safer as it is now more predictable on the edge.
I recomend this mod to anyone who has little concern for the environment and a good friend at a tyre suppliers.