I always run premium in my VW Jetta 1.8 turbo as that is what I've done with previous turbocharged cars, but is it totally necessary in this case? It's an '01 (they increased boost pressure in 03) and it's completely stock. Would it be safe to run 87? Would the ecu just bump back timing and make a little less power? Gas is really expense these days, so I'd like to save where I can, but not at the expensive of my car's health.