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just rev up upto 3-4k rpm for first 2 gears and stay off the gas pedal.
try to just let the car slide...40mph...cruse and avoid stop and go signals...you could get 20mph minimum
if you have to stop and go for every signals in NY, you do get 11mpg..
+1 on this, i drive an is250 and i get like around 12, but on highways i get 27+
I'm guessing it could be either a fuel injector problem or spark plug issue. I also had a sudden decrease in mpg from 22 to 17 and what I did was to just add a BG 44K to a full gas of tank. It brought the mpg back up to 21-22.