Originally Posted by Red90
I was 1.4 with the 2.5NA and changed to 1.2 part way through the 200TDI. I have not seen any change with the 1.2 as far as mileage, but again, I drive even faster with it in..... The 1.6 to 1.4 or 1.2 probably does make a big difference though. The 1.6 is just too low for the highway.
That's interesting. I went from 1.6 to 1.2, then back to 1.4. The 200tdi was added when I went from 1.6 to 1.2. Then when I went from 1.2 to 1.4, I haven't noticed much difference in fuel economy, but I haven't calculated it since that last change. I don't think it has changed much if any, but then again, I also changed the transmission and put bigger tires on it at about the same time.
I ran many tanks of fuel through the 12j and 1.6 combo, and it always came out at 22 mpg. Didn't matter if I was on the highway or in town.