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Old 06-21-2007, 11:32 PM
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Update second tank of gas, around 16.7 MPG, I guess the foot got alot heavier haha.
Old 06-22-2007, 12:05 AM
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Originally Posted by gnomee
Our cars are just idiot proof. GM figured if they told us our car was empty when we still had 2 - 2.5 gallons left we would never run out of gas

Really I think it might have something to do with keeping the fuel pump cooled in the proper amount of gas so it does not burn out any more often than they already do.

If you run it low enough you will see. Your manual will tell you its 15.5 also. I've gotten it low enough to get 14.2 or something in it.
i wouldnt recommend doing that cause as we all know the tank design makes the gas needle drop way faster at the end than in the beginning. i usually try to fill up when it says i've got an 1/8 of a tank left because i know the last 1/8 goes waaaay quicker than the first 1/8.
Old 06-22-2007, 12:09 AM
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o yeah, bone stock my car used to get around 200 miles per tank in about 50/50 city/hwy (refilling at about 1/8 left). now after my air mods (lid, ported tb, ssra) i get close to 250 mpt on the same commute. with premium close to $4/gallon here the mods have started paying for themselves!
Old 06-22-2007, 12:12 AM
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saving gas- driving less is the best solution
Old 06-22-2007, 12:39 AM
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I dont think ive noticed any increase in gas milage with my mods. But i get around 270 a tank, with 70% highway. On long trips i think ive almost got 24mpg.

Are our tanks really only 15.5 gallons, i thought they were 16 or 16.5. Cause a few months ago i filled up with 15.3 gallons, i hope i didnt cut it that close.
Old 06-22-2007, 12:50 AM
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from camarosource.ca (awesome site btw)

1999 f-body changes
"Fuel tank upgraded from 15.5 gallons to 16.8, a non-metallic tank is now used."
Old 06-22-2007, 01:16 AM
  #27  
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I changed my plugs before my trip from West Ky back to Va. #6 and 5 had gaps worn to over .09! Awesome. I made the nearly 900 mile trip on a little more than 1.75 tanks. sorry to lazy to do the exact math but its not to shabby. average of 70-80 mph the whole way. mostly clear highways though.
Old 06-22-2007, 02:13 AM
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yep. 99+ had a 16.somthing gallon plastic tank. 1993-1998 had the older 15.5 gallon metal tank.
Old 06-22-2007, 05:11 AM
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When my 95 would get low in the 14 gallon range you could actually "feel" like it wasn't getting enough gas to keep it going. It was a pretty cool feeling to say the least though not one I would want to expierence often. As if the car wasn't slow enough right?
Old 06-22-2007, 05:47 AM
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My old 99 got around 20ish 50/50 driving. I could get 250ish a tank when being good, and about 225 a tank when rushed for a whole work week.
Old 06-22-2007, 05:59 AM
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I'm sitting on a pretty big cam and speed density and I'm pulling 27MPG on the highway and around 20 city. If I run through a tank hot rodin though I pull about 15 MPG. The cam and tune are awesome for normal driving but the tune will dump the fuel when needed. I love my highway gas mileage.
Old 06-22-2007, 11:30 AM
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I have full boltons with a Yank 4400 converter. I get 18.2 mpg city with Shell 93. (About 290 miles to 16 gallons of gas). I never drive on the highway.
Old 06-22-2007, 11:36 AM
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Thats fine and dandy all, but why the hell am I only getting 200 out of a bone stock car? Now that I realize this is bad, I am all WTF where is my milage. Got new plugs sitting in the back seat, but I am looking for a set of headers now. No use doing one and not the other. HE HE..
Old 06-22-2007, 11:38 AM
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Default me too

Originally Posted by ChocoTaco369
you had a bone stock T/A getting 180 miles to a tank? i get over 300 miles to a tank. i don't hit the center slash until 170, and i've been getting 22 mpg on the summer blend of fuel (18 mpg in the winter). i have a lid, FTRA, catback and a cutout...my mpg's been good. after headers and a tune, i expect even more. sounds like you could use a tune-up my friend.
my car has every bolton 373s and a tune and i average 300 to a tank....somthin is up with those cars getting that low of a mpg....mines also an a4
Old 06-22-2007, 11:44 AM
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Sounds like you may be in serious need of a new tune. That should help you out a good bit.
Old 06-22-2007, 02:38 PM
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i get 24+ MPG actually around 30+ when i drive the highway.usually around 360+miles per tank. i am real pleased it is a LS6 and a M6 maybe that helps.




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