Change o2 sensors every 60,000 miles and use iridium plugs they will outlast engine.
check engine light will not come on until sensors are completely shot,this also goes for your mass air flow,had same issues with 99 beetle happened at 80,000 miles,changed all three items ended up with 35mpg after getting 24mpg before fix.parts are cheap on ebay.
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https://answers.yahoo.com/question/index?qid... Jun 10, 2012 - The same problem presist on slow speed also. ... Still the problem presist on sudden acceleration and when we strart up in signals. .... Ford ikon 2002 clx 1.6i starting problems start quick on running can it be the starter?
Have you changed the plugs, changed the air filter, etc. Many times a clogged air filter will kill the mileage. Have you had a compression test to see if it is just wore out? All sorts of things need to be checked to answer this.
driving in over drive mode actually is what gives the economy as the engine rpms will be around 300 less than direct drive . Lower rpms = fuel savings
OD should come in around 60 klm/hr and drop out at around 50 klm/hr. When you are accelerating hold the pedal in a set position and watch the rev counter (rpms ) and each gear change you will see the rpms drop and then build back up as the vehicle speed increases At 100klm/hr the revs should be around 3200 rpms or less but if over ( say 3500 rpms) then may be the OD is not coming in. One way to test a box operation is to find a speed shop with a dynomometer and test the gear selections against loads and engine rpms
a low cylinder will cause a reduction in fuel economy. also in the winter months many states oxygenate thier fuel, it helps with emmisions but reduces economy. higher octane fuel usually has less feul economy, drop to the mid grade