i used a 3/4 tank almost all the way up in my car, and i only put on like 80 miles, wtf is goin on

 

Thats really bad lol i get 80 to a 1/4 tank...

 

and before its even asked or said, i am driving it nice, shifting at like 3.5 grand max and everything normal

 

did you use 3/4, or use 1/4?
if you used 1/4, that's about what mine shows, the first 1/4 tank goes fast (even tho it's only about 3 gal. worth) and then it's slow from then
3/4 empty tank for me is 7 gal.
if u are getting 80 miles on about 8 gal of gas, check your plugs, and see how they are burning
likely culprits, egr valve, O2 sensor, bad plugs/wires, basic tune up stuff

 

ill change plugs tomorrow, and maybe change my o2 sensor i got a bunch layin around from scrap yards. would a coil pack make a difference

 

i'd say wires before coil pack

 

Might be time for a good tune-up...plugs, wires, PCV valve and air filter. Check your tire pressure and alignment.

 

For me after half tank it gulps then gas it seems. The first half always seems better for me...dunno why...lol Somebody said that there is ribbing in half of the tank that makes it a bitsmaller than the top half but I'm not sure how that effects anything.

So far even with my DOHC computer running richer than my stock SOHC compI still managed to get 270miles out of my tank and I beat it constantly...lol I could tell a huge difference last week when i drove it 160miles straight on the highway that it got awesome mileage I drove that all ona little under ahalf tank of gas, I put it up to 100mph a few times and went a steady 75-80mph. With gas at 500$ a gallon($3.14) I can only afford to fill it about to 3/4s tank. [&:][:'(]

 

oh you'd just love the 34 gallon tank in my truck, try filling that up.
maybe you have a leaky fuel line.... sometimes you dont always notice it right away

 

My 80yr old Grandma I'm sure would have told me if I was leaking anything on herblacktop driveway whenI visit her...lol In-fact my Neon is the only one she allows to park on the blacktop...ahahaha

It going faster after half tank might be in my head I never clocked it in with the odometer.