horrible gas mileage

[crash n burn]

and its bad..my car has bad sparkplugs..so i changed them..not bad..i got a cheap set to run me on for like amonth until i get money right.

i get a set of bosch from autopwn, and the guy says, you dont need to gap(says on the inventory sheet not to)..im like ok, no problem, throw them in..works like a charm. better idle, not as rough.

now when my car has been running around for like 20 minutes, i park it and it idles..it creeps up to about 900-1000..so i still need to back it down a little bit. im guessing the idiot who "did a tune up" on my car before selling it had stalling problems because of the weak spark and just up'd the idle to solve it.

i had 3/4 of a tank..literally..in the last 3 days..i've driven a little more than 60 miles..i've burned 1/4..wtf..seriously..my dad's yukon does better than that.

so im guessing the plugs may actually need to be gapped, because im getting **** for fuel economy and my exhuast is REALLY strong..like im running super rich(as if it doesn't already)

any suggestions?

[12Ounce]

You may be getting too much EGR. Check to make sure the sensor (assuming your year model has one) hose is not broken or otherwise damaged.