General Maintenance & Repairs - mods+mpg?

Just wondering how far my mileage will go down adding future mods, what mods do u guys have and from fill up til gas light comes on, how many miles did u go?

99z, 6 speed, Msd wires, tb spacer, 2nd stage no name clutch, borla catback exhaust, granatelli lid, and tune...

I get 170-180 miles from max tank til light turns on

Just got back from a trip to see family. Filled up before I left. Got gas with 1/8th of tank left 345 miles on the tank. '02 T/A M6. Headers, intake, lid, custom Y and a Frost tune.

I get 400 highway miles in a tank and I'm bone stock save for a cutout. 180 seems awfully low for an M6 I've never got less than 250 for a tank and that was with dozens of 4-5000 rpm pulls

180 seems insanely low

Yea I know, slowly replacing and fixing stuff, eventually ill find out what's causing the loss, just replaced lifter valley oil leak and intake manifold gaskets, Imma replace vacuum lines next to see what happens

I get about 26 mpg on the highway with my mods.

And what r Ur mods? And can u guys list weather u got new cats or not? Just looking at mine they look stock, good also be my mpg problem

when i had headers w/cats, exhaust, intake and tune i was getting 340's a tank. with all my mods now i get 200-250.

First of all throw away your TB spacer. Not because it hurts mileage but because it's pointless.

If you're only getting ~200 miles to a tank, with a 6 speed, something's wrong. That kind of mileage is what a stalled auto with a huge cam should get.

Recently I installed long tubes, an ORY, and new TR55 plugs, and I'm getting my best mileage yet... 21 mpg average (lots of highway driving). And I haven't even gotten it tuned yet.

It's actually a wet nitrous plate from dyno tune but I don't have all the stuff for nitrous yet so I call it a tb spacer for now

Iv got lts magnaflow catback ORY 1 high flow cat after the merge frost tune lid and I get 180-190/tank but I'm all stop and go traffic. I'm a4 no ac ever on windows always down getting mid 14/mpg. For some reason full to e is only 12.6 gallons and I KNOW it's a 16.8gal tank. Wtf would I have ~4.2gals reserve??? Who the fuck knows? I say bad fuel sending unit and ls1tech shot that idea out of the sky. Lol oh well.

Iv got lts magnaflow catback ORY 1 high flow cat after the merge frost tune lid and I get 180-190/tank but I'm all stop and go traffic. I'm a4 no ac ever on windows always down getting mid 14/mpg. For some reason full to e is only 12.6 gallons and I KNOW it's a 16.8gal tank. Wtf would I have ~4.2gals reserve??? Who the fuck knows? I say bad fuel sending unit and ls1tech shot that idea out of the sky. Lol oh well.

When my car was New I ran out of gas as soon as my car hit the E mark. The dealer replaced the fuel pump and said that they adjusted the gauge so this would not happen again? I never questioned them ....but, when it goes below the E mark now it takes 12.5 gallons to fill it back up I believe.

I get between 180 and 200 but I am auto.

I get about 200-215 a tank filling up to 14 gallons comes to be about 16 mpg, all stock SLP intake/exhaust, m6, with new plugs, fuel filter after seafoam, fresh oils (engine,tranny,diff.) Highway i get 23-26 mpgs. Need to replace my fuel press regulator, might just step up to the walbro system.

Think that "adjustment" is similar to a bent fuel level float to read less than what actually there? A buddy's 99 ta goes way past full and gets about 50 before it goes down to the full mark and I at 90ish by 3/4 I'm usually at 90-120 by 1/2 as per gauge reading. Is this similar to yours ls1121?

I get around 24 mpg and I have hooker cat back, fresh tr55 and all oils including diff. My tank holds right around 15 gallons I think u guys that r saying u only hold 12.5 there's something screwy there lol unless u just have smaller tanks

i never really let the light come on but i usually fill up around 240-50 with full exhaust,4.11's with a m6

EDIIT-ok with 240 miles on the clock i used 13 gals i dont drive the car much any more but when i do i have a tendancy to drive it a lil harder than i normally would