Holden Colorado Problems

You say it’s new, but not how many kays it’s done. I would wait until it is properly run in before doing anything rash like fitting an aftermarket chip. While they can improve the economy and performance as you say, fitting the chip would void your warranty on the engine and the drivetrain. If you are concerned about the performance first consult your dealer.

The Colorado will run on Biodiesel, but the issue is that it cleans vanish and other deposits from the fuel system when you switch from regular mineral oil diesel. If you were to switch you should run a replace the filters after running a tank of biodiesel through it. If you do that you should be ok.