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You should check tire pressure. Make sure there are no brakes holding by jacking up the vehicle and spinning each wheel. If those aren't the problem have a look for engine light( suspect oxygen sensor)
Got a check engine light? Get the codes read to find out if the misfires are on all cylinders or just 1. Could be ign coil, bad crank or cam sensor, or a valve issue
CHECK YOUR OIL DIP STICK MAKE SURE YOU HAVE ENOUGH OIL IN THE CRANKCASE.YOUR ENGINE CALL FOR 7 QUARTS OF OIL. IF YOU HAVE THE INLINE 6 CYLINDER.CHECK OIL LEVEL ON DIP STICK.YOU SHOULD BE AT FULL MARK.AND NOT ON THE LOW MARK.IF SO YOU NEED ADD LITTLE MORE OIL TO GET TO THE FULL MARK.YOU CAN USE 10W 30 FOR SPRING AND SUMMER WEATHER. 5W 30 FOR COLD WEATHER COLD CLIMATE.I RUN 10W 30 YEAR ROUND IN ALL MY NEW CHEVY AND OLDSMOBILE VECHICLE HAD NO PROBLEMS.IF OIL LEVEL CORRECT YOU COULD HAVE FUEL PROBLEMS.COULD HAVE STOPPED UP FUEL FILTER, BAD GAS,
What grade of fuel are you using? There are many conditions that effect gas mileage. The way a vehicle is driven, is it shifting correctly, flooring it to get up to speed from dead stop also known as Jack Rabbit starts, driving with the defroster on when it isn't needed or the setting just above that can be used. Back in the 90's most car manufacturers made a change to their heating.cooling system that caused the AC compressor to kick in when the selector was set to defrost. This puts drag on teh motor and decreases gas mileage. Build up on valves and low compression in the firing cylinders will cause you to lose gas mileage as well. Do a compression check on the motor to make sure you don't have abnormally high compression or low compression on cylinders and use a bottle of gas treatment in your fuel to clean some of the carbon build up from injectors and valves. Also start using the Mid grade fuel. Not the High Octane in your area. In Texas we typically have 3 choices 87, 89 and 93 to choose from. Low grade is enough to run the vehicle but performance is low as well as mileage. I use the 89 octane for better performance and better mileage. The High Octane or 93 isn't really good as it leads to higher carbon build up on the valves. Also check your oil often and make sure your changing it every 4000 miles at the longest. All of this along with making sure you change the Air Filter every 5000 miles will increase your mileage.
The PCV and the fuel filter replacements are not going to increase you fuel mileage. What you should really consider is getting some good fuel injection cleaner into the tank, and get an "induction system cleaning". Those two items alone will address most of your mileage issues. The PCV does nothing for mileage, nor does the fuel filter. Also, for maximum fuel mileage, you should have the correct sparkplugs from Toyota in your car. "Aftermarket" plugs doe not perform very well at all.
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