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Old 02-15-2008, 10:12 PM
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mpg

mt trucks onboard computer told me it was only get around 10 mpg. so i tested it sure enough im only gettin around 10 mpg any sugestions like wut to change,check,or mod
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Old 02-15-2008, 11:49 PM
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If you put an exhuast and a intake on it will probally get you a couple mpg's. Everyone seems to talk the Amsoil up, Ive never tried it though. Probally the best way to help out the millage, is to watch youre rpms.
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Old 02-16-2008, 12:07 AM
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Bought my 7.3 pretty much like it is but I was able to talk with the previous owner. Before lift and 35" tires it got 21 mpg. 12 mpg now.

I plan to lower it a bit but I really like the 35s.
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Old 02-16-2008, 03:31 AM
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The 35s don't help you at all and unless the speedometer has been recalibrated for them, you are driving some miles that are not registering. This could be more than a 10% difference. Still that would only give you 11 mpg.

What type of driving do you do? Idle time is very hard on fuel economy with a 6.0. If you don't believe me just fill up your tank, drive about 20 miles then let it sit and idle for 5 minutes and watch the mpg drop like a rock on the dash meter. Even after you have burned 1/2 tank of fuel this experiment will work. Every 5 minutes my truck idles seems to drop the mpg by .1 or more. Another thing that greatly affects mpg is tire inflation. It gives a more harsh ride but max inflation will yield better mpg.

Exhaust didn't yield me any additional mpg. A zoodad mod didn't give me anything either. My biggest gains have been with SCT custom tuning and a good cetane boosting fuel additive. Tire pressure is another area where I see gains or losses. The air filter is an often overlooked area. I changed my first filter at 30,000 miles and although it appeared to still be clean and the filter minder never moved, It was amazing how much of a change I saw when I put in a new filter. The level of black smoke produced by my race tune tapered off drastically telling me that it was indeed time for a change. Fuel filters also play a role in this equation.
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Old 02-16-2008, 09:52 AM
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new fuel air just did an oil change and i i have muff nad kitty delete on my stock 3 1/2 exhaust any other sugestitions
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Old 02-16-2008, 09:55 AM
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I have noticed that mine went down drastically in the winter just due to the increased idle time, and the winter blend fuel.
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Old 02-16-2008, 10:10 AM
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stop racing ha ha yea right
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Old 02-16-2008, 11:03 AM
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The best way to check your mileage is with a garmin or other GPS system. We have 315's on our EX and average about 19 on the highway and 15 around town. Our overhead console is off 4.5 gallons. In a 208 mile trip the odometer read 192 miles not a huge difference but averages 1.5 mpg different than the gps.
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Old 02-16-2008, 01:31 PM
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still even at 1.5 off thats still only 11.5 still way low
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Old 02-16-2008, 02:28 PM
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Not really all that low. My truck averages about 14.5 mixed driving and it is stock height. I get a little over 17 on long highway drives maybe 18 depending on the wind. You should look into a programmer or custom chip it will increase your fuel mileage some. My brother and I both had chevy trucks same options mine was lifted and ran on 35's I got a consistent 12mpg no matter how I drove it. My brother got a best of 11 on highway and 8 around town, mine had a Hypertech programmer on it.
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