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it has a chain hence dosent need replacing.
If the bcm stores the odometer mileage, you need to get one that has the correct mileage in it.
mge
The Ford recommended mileage for replacing the timing belt is 120,000 miles, for the 2000 Focus. I doubt that the engine changed much, if any, between 2000 and 2001.
Yes, in fact, rotating and replacing tires regularly is essential for maintaining your car's optimum gas mileage.
100,000 miles
Common mileage boosters include replacing fuel filter, rotating tires and checking air pressure, adding fuel injector cleaner, installing new spark plugs, checking timing, replacing removable cover with a lighter cover or removing it comletely, disengaging front hubs, replacing timing chain, replacing PCV valve and making sure there are no leaks where it enters engine. IF IT IS EQUIPPED WITH A CLUTCH FAN, REPLACE IT WITH A FLEX FAN (CHEAPEST) OR BETTER YET A FLEX-O-LITE ELECTRIC FAN. REPLACE THE STOCK EXHAUST MANIFOLDS WITH A SET OF HEADERS. THESE TWO ITEMS WILL NET YOU A 15 TO 20% INCREASE IN GAS MILEAGE. CORRECT TIRE INFLATION IS A BIGGIE. HERE'S THE EASY FORMULA. 1 PSI = 2 % LESS MILEAGE. IF IT CALLS FOR 35 PSI AND YOUR AT 32 PSI, YOUR LOSING 6% OF YOUR GAS MILEAGE. INFLATE YOUR TIRES TO THE CORRECT PSI, WHEN THEY ARE DEAD COLD. A MANIFOLD VACUUM GAUGE, MOUNTED INSIDE THE DRIVERS AREA SOMEWHERE, IS A DIRECT GAS MILEAGE INDICATER. THE LOWER THE READING THE WORSE THE MILEAGE. YOU WILL BE AMAZED HOW THIS DEVICE, IF USED CORRECTLY, WILL INCREASE YOU MILEAGE BY JUST SHOWING THE INSTANT READOUT YOU NEED, TO MONITER, MINUTE BY MINUTE, YOUR FUEL USAGE. GOOD LUCK.
It could, if the old gasket had failed.
Your mileage is correct. "You're "is short for "you are " so would make no sense in your question.
No. A car will get better mileage with the correct tire pressure.
You won't know it needs replacing - it fails catastrophically, without any symptoms. Factory recommended replacement mileage is 95,000 miles. If you have passed that mileage you are living on borrowed time.
You can get a Federally approved form from DMV to record actual mileage and keep with vehicle and just add that mileage the accumulated mileage on the new speedometer