I some of you want more power. I love my bonneville but i need it to get better fuel economy. I was wonder what mods/repairs i could do to get better fuel economy? like if i put the k/n filter would it get better gas mileage, that kinda stuff?

a more free flowing intake will help, your stock airbox is pretty restrictive. you can make your own, or gut your airbox, or get a custom one from Speedyguy, heres an article on intake mods http://bonnevilleclub.com/techinfo/?article=40

freeing up your exhaust flow, such as by getting a high performance muffler will help as well, also making your car sound nice heres another article on common mods that will boost your performance a little http://bonnevilleclub.com/techinfo/?article=52

basically anything that will get your engine breathing better will help your gas mileage, as long as your not overly enjoying your newfound performance that is.

getting a basic tune-up might help also, and if your really desperate for better gas mileage, i THINK that running higher octane gas will help with that some. but DO NOT switch back and forth between high grade and low grade, pick one and run with it. because your PCM "learns" as you drive, and if your switching back and forth between gas grades, its just gonna cause it to do wierd stuff and youll get even worse gas mileage.

perhaps later youll get the assistance of a guru who can help you out even more and give you technical definitions and stuff, but for now your stuck with me.

I would say a tune up would be the best benefit. How old are your plugs, O2 sensor, air filter, fuel filter, PCV, etc? Also consider cleaning your fuel injectors.

Its hard to do, but the best thing to do is have a light foot on the gas pedal...

If you have a good running engine, then an Intake helped me a lot. Good driving helps too.

If you really want to maximize fuel economy all the above mentioned things should work. You can also do a few other simple things that should add up to some more mpg'*. Make sure your running a 195 stat, if running 10-40 oil, change to 10-30, or better yet 5- 30, this will lighten reciprocating resistance somewhat. If your inflating tires at 30 pounds{bonnies seem to ride nice with 30}, add 4 or 5 to reduce rolling drag. You may sacrifice alittle ride. If feasible, check lining drag on brake roters. you would be suprised at the mis-adjusted pads out there. If you go this far, go ahead and pack wheel bearings, and have alignment checked.
A new fuel filter is imperative. I replace mine every 5000 miles . Injectors are pressure sensitive, and any decrease in pressure will be made up in volume, {more gas used} . And for the really anal, a nice smooth coat of WAX... With gas prices what they are anything helps..... I wonder how much resistance the front lisence plate makes?.........

thanks, i didnt know the fuel filter was that important ive had it for two years and 40,000 miles never replaced it. its hard to get my car pretty low riding. everthing except the fuel filter has be replaced in the last year or year in half put platinum spark plugs 10-30 for high mileage vehicles cant afford the synthetic oils. i still have the original exhaust on though but the places around here charge outragious prices. how often should i replace the charcoal canister?

40000 on the fuel filter? It may be the best 10 bucks you ever spent replacing that thing.
I wouldnt mess with the charcoal canister until it started acting up. Nothing you can do there would help fuel mileage anyway. It stores fuel vapors until a solenoid lets the vapors get sucked into the combustion process. If upon opening the hood and you smell gas, I would check for cracked lines and the such. The system may purge to the atmosphere from time to time, especially in the summertime heat. Hope this helps...

thanks a lot. Where is the fuel filter at? i dont climb under my car much i have a crankjack so it takes forever to get up to climbing level to look under it.

I agree with most of the above suggestions. Also, make sure your tires are between 32 and 35 psi. And while your adding some free air to your tires, it'* a good idea to make sure your spare has about 60 psi in it BEFORE you need to use it!

You can change the filter on your ramps. If you dont have those I would get a set of the shorter ramps. They are not as high as the old standards. {air dam will push them out of the way as you try to run the car up. Anyway, the filter is located on the passenger side underneath the back door. You may want to back the car up on ramps, or it can be done without ramps. Put a crescent wrench on the filter boss, and a {i believe} a 5/8 open end wrench on the fuel line fitting and back off using the crescent as a backup to keep from twisting the whole filter. Have some rags around to sop up gas. The tank side of the line is a Quick diconnect that requires sqweezing tabs and pulling the nipple out of the line. Once your under there you will see its pretty simple. stick the new filter'* nipple in first and push until the tabs 'click'. tighten otherside, start and check for leaks. I do like to loosen the tank cap, but there will be some fuel under pressure so dont freak, it will quit, and remember NO SMOKING while your doin this. hope this helps....