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Unread 06-11-2004, 07:01 PM   #1
AWILD
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10 gals of gas and 115 miles??? Stock 4cyl

Ok this was the first highway trip I took back to my home 1.5hrs away from school. I filled up the tank from about a quarter tank. Drove about 75-80mph in 5th gear most of the way on the expressway. When I got home (115 miles) I was back down at a quarter of a tank. This used just over 10 gallons of gas that I had put in.

The stock 4cyl is rated at 18/20 for manual and I am getting around half of that. Any thoughts? I really need to fix this issue.

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Unread 06-11-2004, 08:13 PM   #2
sentinal02
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Quote:
Originally Posted by AWILD
Ok this was the first highway trip I took back to my home 1.5hrs away from school. I filled up the tank from about a quarter tank. Drove about 75-80mph in 5th gear most of the way on the expressway. When I got home (115 miles) I was back down at a quarter of a tank. This used just over 10 gallons of gas that I had put in.

The stock 4cyl is rated at 18/20 for manual and I am getting around half of that. Any thoughts? I really need to fix this issue.
yeah, stay away from 75-80 mph. seriously. but even then that's a bit low. do a full tune up: plugs, wires, dist, rotor, O2 sensor if it's due, oil change and filter, fuel filter, and air filter. run a bottle of injector cleaner through the tank and see if all that does any good. if not, there's probably something else going wrong, maybe a clogged cat, bad sensor or something similar. also, if you're running bigger tires then stock, adjust the milage for that and expect to get below the manuf. rated (16/19 is more realistic)
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Unread 06-12-2004, 07:10 AM   #3
angler
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i've found with either the four or six, any faster than 65, and it sucks the gas. try driving a tankful without going over that and you will be amazed at the difference. i get 21 with my 4.0, and that is without going over 65. i travel 70 miles round trip to work each day, and if i run at 70, my mileage drops to about 17. i ripped the wire off the o2 sensor when wheeling once, and my mileage dropped to 14. might want to change it if it hasn't been done in a while.
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Unread 06-12-2004, 09:45 AM   #4
AWILD
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I'll probably do the full tune up, o2, oil deal this week. I just bought the Jeep a week ago so I havent had much time to get into it.
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Unread 06-12-2004, 10:30 AM   #5
GrimJeeper91
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Speed kills gas mileage. Jeeps are not aerodynamic and there's a lot of loss due to drag. The relationship between velocity and drag is a not linear one, more like exponential. So what do most of us do to a vehicle that not aerodynamic to begin with? Lift and larger tires. Fortunately most of us don't buy them for their gas mileage or comfort.
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Unread 06-12-2004, 05:26 PM   #6
myndphuct
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In addition to the tune-up and such, I've gotten a very noticeable increase in mileage since switching from the clutch fan setup to an electric fan for cooling. Freed up a noticeable bit of hp too.....nothing dramatic, but I can definately get up to cruising speeds quicker.
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