Quote:
Originally Posted by ppdmostwanted
I don't really think the fuel filter being dirty would effect mileage. It would mean less power and hesitation, or killing the engine all together during idle. But in your goal for better mileage You might want to think about where the resistance is in your car. Meaning check your brakes for drag and bearings for resistance, transmission for enough / clean ATF, engine oil, AC compressor for wear, etc etc etcetc etc Your car has resistance somewhere in the drivetrain. Good luck
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Wow. That was retarded. A clogged/dirty fuel filter can easily reduce fuel flow to your engine and easily reduce gas mileage, and if it ever got bad enough it can keep you from even starting your car. When trying to increase gas mileage you want to focus on the things you need the most, Air/Fuel/Spark. Free flowing exhaust/catalytic converters, K&N or aftermarket air filters/intake, replacing spark plugs and wires, and replacing fuel filter and even cleaning out the injectors all can really help increase your gas mileage.
Basically, a full engine tune up is your best bet when trying to restore gas mileage. Then secondly I would worry about your fluids, make sure you're changing your oil about every 3000 miles or so, not using shitty conventional oils like Pennzoil or Quaker state, make sure your coolant is a good balance of 50/50 and is full, keeping your engine as cool as possible, and changing your transmission fluid shouldn't have much affect really, but could still be a good idea if it's looking bad.
Then third, you can worry about the other things, like of course make sure your wheels are spinning freely, no bad wheel bearings or stuck calipers, and stuck or rough spinning pullys on the engine. Bad or shitty tires can affect gas mileage as well, nice brand new tires roll much more smoothly down the road, quieter as well. And of course, make sure the tires you do have are properly inflated at all times, usually between 30-35psi.
If I left anything out feel free to add in. But that pretty much covers most of what you need. But honestly, the biggest affect on your gas mileage, is how you drive it, what you have in your car heavy wise, as in multiple people a lot, and whether or not you do a lot of freeway driving or city, and a lot of hills or not, etc.
Hope all that helps. If you want a comparison, I take pretty good care of my car and almost everything I mentioned above I've done to my car.
I have a 89 Corolla GTS, 1.6 DOHC 5 speed.
I get an average of 22-23 mpg City, and 32-34 mpg if all freeway. And I drive all of those conditions.
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