Since I like to watch my pennies I have been monitoring my MPG in my 20vt BVR engine. So over 8 weeks I am getting this, an overall of 31mpg. I do around 40-45 miles a day, mostly B roads and Town driving and I do like to press the loud pedal a fair bit! I am shocked at how good these engines are on fuel. I only run mine on Shell V-Power and change the oil, oil filter and plugs every 3k as I am a bit anal like that! But still, 31mpg, that is the same as my old MK2 GTI 8v and better than my MK2 GTI 16v and heaps better than my MK3 VR6, yet performance puts all of these cars mentioned to shame! She will pull with ease to 135mph and the speedo will go off the clock (160mph on speedo) when flat out, so in real terms most probably 145mph (Runway attempts at this speed)
So the negative.....Well she is a MK3 Golf and even with a 20mm drop on Koni's, Koni shocks, front and rear strut braces the handling is not up to the performance. This maybe due to running 195/50/15's, maybe I should be looking at 215/45/16's or another option is to drop her 60mm and see how that feels.
Overall......Very happy and I would suggest a 20vt engine highly......Just need to figure out how to get her to handle well.