miles per tank

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Ceejkay

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i just was wondering about this the other day. it seems im always filling up. well i found a problem 145 per 25 gallons. that equals somewhere in the 6ish mpg. for a stock truck that aint right.
 

SunlitComet

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i just was wondering about this the other day. it seems im always filling up. well i found a problem 145 per 25 gallons. that equals somewhere in the 6ish mpg. for a stock truck that aint right.

you got problems friend. in fact mine has taken a dive as well to ten mpg. I have a whistling sound somewhere under the hood so when i get the ball joint replaced tomorrow im a gonna have it probed for a vacuum leak somewhere. just can't see how after i did the ported tb it was fine and even better then suddenly crapped out.
 

99TanHoe

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you got problems friend. in fact mine has taken a dive as well to ten mpg. I have a whistling sound somewhere under the hood so when i get the ball joint replaced tomorrow im a gonna have it probed for a vacuum leak somewhere. just can't see how after i did the ported tb it was fine and even better then suddenly crapped out.

Wish I could help you Sun, but you know more about em than I do. Let us know what you find, I'm sure someone else will be running into the same problem somewhere down the road. How many miles you got on it?

The drop wouldn't have happened after the performance runs you were doing the other night with your Scangauge?
 

SunlitComet

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I started noticing it before the fuel pump probably went bad and when I ran the numbers against the old ones I notice the high numbers on the 0-60 and higher sets. Mind you that whistling sound was not there before. Will have to load the engine I think to reproduce it to locate it. So I will what the shop can do. Not comfortable spraying wet liquids around everything looking for a change in rpm and I dont have a propane enrichment kit around.
 

Tricky

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I am getting 275 to 300 a tank full with stock drive train plus airaid intake kit and running 22's with over 200K miles.
 

Donnie Yukonie

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:emotions133: i honestly dont see it either i haavent checked in a while but im pretty sure i get maybe 225 250 on a full tank no bs how the same trucks are getting almost 400 or more bewilders me i dont drive like a pissed off teenager either thats for my daytona :)
 

_Dylan_

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I don't know what you consider a full tank to be, but 28 gallons and 400 miles is 14 mpg. I get around 14 city/17 hwy.
 

noJeepshere

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Please specify if you're driving a tahoe/yukon or suburban type truck. As the suburbans do have larger gas tanks than tahoes. Short wheelbase trucks (both 2 and 4 door) get a 26 (what GM calls 30) gallon capacity tank, while the suburbans received a 42 gallon tank.

I get around 250, all city, 26 gal tank.

If this is true, then I'm not sure how I managed to squeeze in 29.8 gallons when I ran my tank dry years ago...

Usually in the summer I start looking for gas around 300 miles, though normally I can get 450 out of it before I'm getting nervous. I like to keep fuel in the tank because the pumps on these are not known for their reliability and they use fuel as a way to keep cool, so if you urn it low on fuel it'll get hot and fail sooner.

Once, because I had the time and wanted to see, I took some backroads and set the cruise at 55 mph and drove to Utah from Washington and almost did it on a tank. That was 575 miles. It pays to go slow, as that netted me nearly 20 mpgs.

Normal driving (mostly highway) I net 16.1 with the a/c cranking.
 
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