i know sometimes it can be bad struts/shocks, but also i have heard it could be from keeping the gas tank empty ao full all the time.
any other suggestions??

 

improper inflation, alignment, shocks/struts being bad

 

how do you really tell if the struts/shocks are bad w/o taking em off the car. i can push down on teh corner of the vehicle and it bounces right back once

 

how many miles are on your car? i replaced my shocks at 118k, they were toast, fsttyms1 was able to get more out of his, it all kind of depends. cupping has nothing to do with a full or empty gas tank. bad alignment, improper tire balance, bad shocks (springs generally last the life of the car) will cause cupping. It will also make some road noise and generally bad driving characteristics.

 

Lack of tire rotation, improper alignment, wore suspension/steering components, improper inflation, aggressive driving, over loading, the list could go on and on. Some cars even when everything is in check will still have slight heal and toe wear(the technical name for cupping) with some tires. Its not a perfect world and not all tires work well on all vehicles with individual driving styles. So there is really no answer to this with out knowing a lot more information

 

go to each corner, and push down, if it bounces back slowly, time to replace

 

71k. its on the es i just got. i may just get a new set and go from there. everything on the car looks solid, and each corner bounces back quickly