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  #1  
Old 05-19-2011, 02:24 PM
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Default Gas Mileage and Mud Flaps

So I wouldnt even post this if I didnt think there was something to it because it seems so crazy and farfetched...anyway so I live in Chicago but my family is from Southern IL and I make that drive at least once every 2 weeks. So after doing this drive for a while I know exactly how much gas my truck is going to use each way as its the same everytime. Its a 362 mile trip one way so I know when I get to my fathers house my gas light should just be coming on. Well on sunday I was getting ready to leave, and Im looking at my truck and realize I dont really like the mud flaps on my truck and decide to take them off before I leave. So I go to the gas station fill up the gas tank and Im on my way. 362 miles later I arrive at my destination and to my surprise I have just over a quarter tank of gas left...so in my head I chaulk it up to maybe I was driving with the wind or anything else. So yesterday I am heading back to Chicago and I pull into my driveway at home and once agian I have over a quarter tank of fuel left. And I drive the same MPH every time i do this, I set the cruise at 70. So the only thing different I have done is take off the mud flaps...I know they would definitely have wind resistance but that much? The only thing I can think of is I read about when driving down the road there is a bubble of air that forms in your bed and helps make you more fuel efficent, and the mud flaps could potentially add a low pressure air zone that would disrupt that air bubble in your bed...anyone else heard of this or think Im crazy or have any imput on this? lol
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Old 05-19-2011, 03:19 PM
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You could be on to something, however, a quarter tank difference is 6 plus gallons, which means you would have gained 5mpg give or take....doubtful to be credited to mud flaps. If it were true, I advise everyone with mudflaps to immediately remove of them for a 25% mpg gain! lol....its gotta be something else...
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Old 05-19-2011, 03:23 PM
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yea I know right? I have physically gone over everything in my head and I have done nothing different to my truck other than that. And after 20 plus times of making this drive and always getting done with 1/8 of a tank then suddenly twice in a row i finish with just over a quarter of a tank...I just cant figure it out, i mean im not complaining, but would like to know what is causing it and like I said the only different variable would be the removal of my mud flaps lol
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Old 05-19-2011, 03:35 PM
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put em back on and make the trip again, see what happens.
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Old 05-19-2011, 03:38 PM
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That much of a difference??? Man, I don't know....But if that's what you experienced, I guess they do disrupt the airflow enough to be detrimental to MPG.

Normally, one test is not a finite result. Next time you go, put them on and try it again.
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Old 05-19-2011, 03:44 PM
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yea I will do, I know it seems weird, and the first time it happened i was like man im a lunatic if I think the mud flaps caused me to get worse gas mileage, but i did a google search a little bit ago, and other people on different sites with different vehicles have said similar things. But next time I go is the first week of june so I will put em back on and report my findings.
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Old 06-12-2011, 12:43 AM
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Just wondering did you try an put your mud flaps back on and make the drive? Did it change anything?
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Old 06-20-2011, 02:37 PM
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nope sure didnt, ive left them off but am enjoying the little bit of extra mileage ive been getting, ive also changed out my spark plugs and been running fuel injector cleaner through my system, all of which have helped a bit on the mileage.
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Old 06-20-2011, 04:16 PM
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Just a thought, No matter where you buy your gas, or which brand, gasoline is sold to stations and brought by trucks from a refinery somewhere.... Whatever gas is in these trucks is delivered to the different stations regardless of what brand the station displays...in other words, most gas stations in the same area sell the same gas, no matter whether the pump says Shell, Arco, Chevron, Mobil etc.... Perhaps, you have been recently been getting a different brand or blend of gasoline that is giving you some better milage....I recently added flaps, and they didn't make any noticeable MPG difference on my Ram, A CAI and throttle spacer, however dropped my milage by about 3mpg overall
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Old 06-20-2011, 04:46 PM
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yea that would make sense actually, as I get better mileage when I come from the South to the North and worse from north to south, and i dont mean im driving and hour south and hour north and measuring my mileage, I am constantly driving my truck from Chicago to Nashville and then from Nashville to Chicago and consistently Im getting better mileage with the southern gas. But those drives will soon come to an abrupt hault as Im moving to Nashville within the next 3 weeks, cant wait to get there.
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