10 gals of gas and 115 miles??? Stock 4cyl - JeepForum.com

 
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post #1 of 6 Old 06-11-2004, 07:01 PM Thread Starter
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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post #2 of 6 Old 06-11-2004, 08:13 PM
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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post #3 of 6 Old 06-12-2004, 07:10 AM
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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post #4 of 6 Old 06-12-2004, 09:45 AM Thread Starter
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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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post #5 of 6 Old 06-12-2004, 10:30 AM
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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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post #6 of 6 Old 06-12-2004, 05:26 PM
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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.

89 yj, 44 front soa on Waggy springs, Toyota 8" rear soa on Dakota's. AMC 360, TF727, Stak4x4 D300 RAC Driver drop. 106" wheelbase.
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