What brand of plug did you use?

If Bosch, throw them out, and replace with NGK or Denso Super. Since it is winter, you should be able to advance the timing to 7* as well.

Keep the speeds down to 100 kph, and you should surpass 20 mpg (less than 11.75l/100km).

"A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living." - John F. Kennedy

Proud owner of an 88 Montero (with a blown engine).