I got a 97 vision 3.5 and i am havin big fuel economy issues what all can i do to help improve it?

commenting on fuel consumption is like asking "how long should a piece of string be?". The variables to be considered are tyre pressures, size of tyres, width of tyres,tread patterns,wheel alignment, loads carried by the vehicle, climate temperature and conditions, driving techniques,traffic conditions, speeds travelled, use of gears to maintain correct torque range from the engine, electrical loads required from the alternator and terrain conditions
Some of the things that you can do to improve fuel economy include selecting neutral when stopped as this reduces the load on the engine at idle and the fuel setting is less, having your foot on the clutch loads up the thrust bearings on the crankshaft. An automatic is always trying to drive when stopped so by placing it in neutral when stationary allows the engine to idle at a lower fuel setting. run on standard size tyres and increase the air pressure around 4psi make for less rolling resistance from the tyres so the economy will be improved. Carrying as little as is necessary, (That includes driver and passenger weights) reduces the load on the engine--more economy.Using a cruise control were possible or reading the traffic conditions so that vast speed changes are required less so will improve economy. experiment with different octane rated fuels ( be wary of e-fuels) While you may be reading manufacturers sales rubbish about the expect fuel consumption of a particular vehicle remember that it is sales talk as economy is heavily dependant on engine/vehicle design and driver technique. Basically there is no one single thing to consider for fuel economy but ultimately it all comes down to the driver.

To put it as simple as I can --the faster you go the more fuel you use-- Not rocket science really.-- At the recommended speed the vehicle is in the optimal torque range and is returning the best economy for that speed . any thing over and it takes a big nose dive.. At the recommended speed you have maximum control of the vehicle and it will last the longest time . Now you have to improve the economy by paying attention to the following items
Tyre width , size pressure is critical to economy
Loads being carried at speed is critical to economy
Add-ons such as load racks add to fuel usage so take them off.
Fast take offs at lights uses fuel. If you let the engine bog down instead of changing gears will use fuel.
Not using the cruise control uses more fuel as every time you alter the accelerator pedal position that is extra fuel being used.
Using E fuel mixes will lower economy. So economy is a matter of your driving habits and not of the make of vehicle.
If you want better economy at the speed syou travel at then visit a speed shop and have the CPU re-chipped for more power at the higher rpm's but be aware that it may void your warranty on the vehicle.

first question to ask is it a petrol or diesel. Next how much load is it carrying . Third question have you checked the cat converter lately for failure that is blocking the exhaust Next question have you run the fault codes since you noticed that the fuel consumption is excessive Are you running big wide tyres and at the wrong tyre pressure . If you can come back with some answers then may be we can point you in the direction you should be looking at to improve the economy.

I don't think you'll ever beat what you're getting for mileage now. Those numbers are really good.Improving performance usually sacrifices economy.

Here are some tips on how to improve your fuel economy:
- Going fast is so tempting. Not only do we do it to keep up with the flow of traffic, but if we can save even five minutes, it seems worth it. But if you're on the highway, driving 60 miles per hour instead of 70 mph will save you 2-4 miles per gallon over the duration of your trip.
- Take it easy on the throttle. Don't accelerate quickly or stomp on the brakes. Coast to a stop. You'll save on fuel as well as wear and tear on your brakes, which will save you even more money.
- Shut down. If you're waiting somewhere for a while, like at a train crossing for instance, turn off your engine. Even if it's just for a minute, it can make a difference in your fuel economy, especially if you drive in the city a lot.
- Don't warm up your vehicle for more than 30 seconds. This is a tough one, especially for us here at Consumer Guide®, where Chicago's frigid winters are a way of life. Thanks to technology, however, most modern fuel-injected cars only really need 30 seconds to warm, and hot air can start blasting into the cabin very shortly thereafter.
- Windows up. Again, this is tough, especially on pleasant days. But having the windows down creates aerodynamic drag that causes an engine to work harder. On the highway, this can decrease fuel economy by up to 10 percent.
- Check your tire pressure. Making sure your vehicle's tires are set to the recommended pressure can increase fuel economy by as much as 3.3 percent.
- Breathe easy. Next time you get your oil changed, have the air filter checked as well. Replacing a dirty air filter with a clean one can save up to 10 percent on fuel costs.
- Make sure your vehicle is in top running order. Read your owner's manual and follow the manufacturer's recommended maintenance schedule. If it's time for a tune up, do it and you can realize up to a 4.1 percent increase in fuel economy.
- Buy the right gas. Your owner's manual will list the correct octane gasoline you should use for your vehicle. Purchase whatever is recommended and no more. Premium-grade fuel is more costly and won't improve economy in vehicles designed to run on regular.
- Lighten up. The less weight in your vehicle, the better your fuel economy. Clean out that trunk!
- Grease up. Using the manufacturer's specified motor oil, and changing it per factory recommendations, can improve fuel economy as well.
- Combine trips. Don't run out two or three times a day. Hit all the stores you need to visit at once, and if possible, go to shopping malls where you can park and walk to several stores at the same time.
- Cool down. Gas up on cool mornings. Fuel is denser when cold. Gas pumps measure by volume, so if you pump when it's cold, you get more gas for your buck.

When is the last time you had a tune up? Have you changed the spark plugs lately? An often overlooked item is the air cleaner. A plugged air cleaner can take 3 or 4 miles a gallon off your average. You can purchase a K&N cold air induction or a cheaper brand, this includes the cleanable air filter and chrome air intake hose, replacing the stock. This should improve your gas milage by 4 or 5 miles per gallon.

Keep your services up also on the transmission. Try this simple fix, get some octane booster and injector cleaner and put them into the tanks $8. Hopefully this will help break off the carbon deposits in the injectors and give you a smooth economical ride. Good luck

Use a good fuel injector cleaner every 15k and change your air filter as needed. If it looks clean it is. The most you should be changing the AF is approx. 15 to 20k. Unless you live in a dust bowl or have the only diesel camry I know of. I recommend the use of nitrogen in the tires for improved tire wear and fuel economy.