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Very Poor Milage



Ok i was getting poor milage on my 1988 16v Before, now its way worse which
doesnt make sense. I changed the spark plugs(old ones were black) i changed
the thermostat to a 87 degree one ( old one was 70) and changed the Air
filter to a K&N(old one was super dirty) and put premium fuel in my car for
once and got only 150 miles for the whole tank! i was getting 240 before.
any ideas/suggestions? thanks!