I think its pretty concise most if not all well running 1.6's can achieve 50mpg fairly easily.
I don't get less than 42 in my 85 td jetta.That is with acn trans and 75% of driving @ 70mph on freeway, other 25% on slower up/down mountain passOne thing that I find very interesting is I brought this car home a year ago and as is it was getting close to 50! Since I have rebuilt all the suspension, tires, alignment and tons of little things like a leaking injection pump and it does this to me, lol!I am awaiting a valve cover and getting another ip pump rebuilt to start fresh with injectors and will time it up and hopefully be back where I was. Its amazing when driving allot how much of a difference that little bit makes as far as diesel pump price in cali being a premium right now, and comparing it to an older small gas car to commute in.