I'm sorta your lesser kindred spirit here , up until May 2013, I had both a Mk1 and Mk2 A1 Scirocco, each for 25+ years.
Many of us old VWdubbers were pretty bummed that VW didn't send us any new models, although there was enough interest in the enthusiast crowd to sell a few thousand, at least we thought that.
Yeah, a good ECU tune for that turbo motor could cost that 900 bucks...I don't think it'll give the car any better gas mileage though, maybe a few mpgs at most if at all. It'll certainly make the motor put out more power....which all Sciroccos need.