I have almost 90K on my 99 Ex Sport and the gas milage has gone from about 18 mpg to about 14 mpg. Any ideas?

Thanks

I hate to sound like a broken record, but you are almost ready for a tune-up. (At 100k, my stock plugs were really worn.) The tune-up is cheap, and probably necessary. If the low gas mileage continues after the tune-up, at least you have ruled out the #1 probable cause, and performed preventative maintenace at the same time.

Good Luck!