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Old 05-28-2010, 03:40 PM   #1
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mpg / fuel tank size

Hi all,

I have searched for this, but I am getting different numbers so I thought it was time to post. I have a 93 - what size fuel tank do I have? I read somewhere 20 gallons, somewhere else 17 gallons, but today I filled up 7/8ths of a tank and only put in 10.1 gallons. Lets assume oem.

Second, what are you guys getting for mpgs? As I am driving the jeep daily more or less now due to the weather, I am noticing that the fuel economy isn't as good as my wrx (makes sense, older truck), but I just want to make sure I am ballpark everyone else. Manual transmission.

Thanks all, enjoy the holiday weekend! My dogs and I are waiting for the wife to come home in a couple hours for a ride to some trails for a hike and swim. Three Day Weekend for the win.

Matt

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Old 05-28-2010, 04:13 PM   #2
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Chances are you have a 22 gallon tank installed. However, there inserts in the fill and vent necks that will fool the pump into thinking the tank is full when it's now. How long those tubes determine what the capacity is.

There's a write up somewhere on how to trim them.

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Old 05-28-2010, 05:21 PM   #3
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22 gallon!?!?

I had 1/8 tank this morning, I filled it, and used 10.1 gallons - doing a little reverse math gets me to 12.6 gallon fuel tank size - what am I doing wrong here?

Would those vent necks and tubes add up to such a discrepancy in numbers?

thanks
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Old 05-28-2010, 09:43 PM   #4
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The tanks were stock at about 17 gallons (really about 22) and if you paid for the optional large tank, you got the same tank with a different filler neck.....do a search, there are instructions on how to change yours over. I get about 20mpg around town.
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Old 05-28-2010, 10:57 PM   #5
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mine is about 17ish.. i get right at 16.0 mpg driving mine everyday.. 2.5 4 cyl 5 spd
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Old 05-29-2010, 12:15 AM   #6
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I just filled up tonight and got around 19.6 mpg. Depending on how i drive (sometimes i'll drive economical and sometimes i like to have a little fun) i get between 15 and 20.
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Old 05-29-2010, 12:54 AM   #7
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Quote:
Originally Posted by Moojamboo View Post
Hi all,

I have searched for this, but I am getting different numbers so I thought it was time to post. I have a 93 - what size fuel tank do I have? I read somewhere 20 gallons, somewhere else 17 gallons, but today I filled up 7/8ths of a tank and only put in 10.1 gallons. Lets assume oem.

Second, what are you guys getting for mpgs? As I am driving the jeep daily more or less now due to the weather, I am noticing that the fuel economy isn't as good as my wrx (makes sense, older truck), but I just want to make sure I am ballpark everyone else. Manual transmission.

Thanks all, enjoy the holiday weekend! My dogs and I are waiting for the wife to come home in a couple hours for a ride to some trails for a hike and swim. Three Day Weekend for the win.

Matt
Your fuel gauge is probably off, Mines off ~1/4 tank (when it says full its really 3/4)

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