city mileage fine, highway mpg bad
#1
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Year: 2000
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city mileage fine, highway mpg bad
Have a 2000xj, 4.0l engine 231 tcase. I added a overhead console because i found one in the junkyard and i like the information they give. I know that the numbers aren't going to be perfect with bigger tires, but in the city i get anywhere from 18-22 depending on speed. On the expressway going 70, i get 12-14mpg. I know aerodynamics play a part in this, but most people usually get a few more mpg on the highway instead of less.
I have new plugs, and seafoamed the engine recently. the only thing i can think of is the precat o2 sensor?
any idea or do you think its the o2 sensor?
I have new plugs, and seafoamed the engine recently. the only thing i can think of is the precat o2 sensor?
any idea or do you think its the o2 sensor?
#3
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are you just going by the junkyard mpg gauge or you actually filled up your tank, drove in the city for 50-60 miles and then put more gas and measured the mileage, and then did the same on the highway. because frankly, 18-22 is more like a city gas mileage for a medium size car.
#4
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my "city" miles arent really stop and go like most would think. its pretty much a constant 45-50mph. I know that isnt city driving for some.
Either way, i dont think the console should read less on the expressway. I do know it seemed to suck up a bunch more gas before the school semester ended traveling about 14 miles from home and back i burned a bit less than a 1/8 of a tank.
edit: Tural, im strictly going on what the console is saying (i know its off). I calculated the mpg in my head the first few tanks but i know it sucks up a lot more gas on the expressway compared to normal city driving going the same distance.
Either way, i dont think the console should read less on the expressway. I do know it seemed to suck up a bunch more gas before the school semester ended traveling about 14 miles from home and back i burned a bit less than a 1/8 of a tank.
edit: Tural, im strictly going on what the console is saying (i know its off). I calculated the mpg in my head the first few tanks but i know it sucks up a lot more gas on the expressway compared to normal city driving going the same distance.
Last edited by EMAXX620; 05-15-2010 at 11:58 PM.
#5
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50-55mph. is going to give you your best gas milage anything above 60mph is going to increase your fuel consumption. At 70 I'm getting around 10-12mpg. Stop and go with a 7 mile sprint at 55-60mph. 15-17mpg.
#6
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alright timber wolf, i know what you mean about the 55-60mph being the best, just wasnt sure how reliable the change in the console was from a 5-10 mph gain. ill just keep it a bit under the speed limit
#7
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Year: 1999
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city mpg means 25 mph and red light every block.
so, it's actually normal that you're getting 22mpg driving at 45mph and 10mpg driving at 75mph.
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#8
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yea, theres nowhere that the speed limit is 25 here besides in neighborhoods haha. i figured my highway was a lot lower than usual though as i seen people here saying they got 16 highway, but didnt take in consideration that a lot of states the highway speed limit is 60 instead of 70.
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