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Old 02-24-2008, 03:27 PM
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I'm confused

I have been trying to get better fuel economy by following the advice of other posts. I have a air intake system, 4" exhaust, and a dp tune and itp overboost.

I have been driving around with the 80 econ trying to get mpg... Well, my mpg went from pretty consistant 16 to 10. I have not been getting on the gas pedel because I was trying to get the best mpg.

Does the overboost effect mpg?

Any Ideas???
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Old 02-24-2008, 03:51 PM
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no the overboost anilator (spelling?) won't affect your mileage, just stops your truck from reading too much boost and going to limp mode... That is strange you went from 16 to 10mpg. I know with the winter fuel and all the warm up time and idle I'm getting terrible mileage too right now, but that's just weather related. Did you see this drop off all at once as soon as you hooked up the dp-tuner? Or was it a gradual decrease?
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Old 02-24-2008, 03:53 PM
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also do you have a set of gauges in your set up, Ie: EGT, boost, tranny? I'd be interested in knowing if all your temps are staying in the normal range.
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Old 02-24-2008, 04:00 PM
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yes, it was right after the install........ I've had two fills
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Old 02-24-2008, 04:03 PM
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thats odd, i get so much better with mine chipped up and i pull the chip out and i get noticeably worse mileage
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Old 02-24-2008, 04:29 PM
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Zip tie a small piece of wood to the bottom of the skinny pedal and your mileage will soon return.....
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Old 02-24-2008, 04:48 PM
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Hmmm, That's weird, nothing you did looks like it has much of a chance of messing something up. Do you have gauges? How is your boost and EGT's? I don't have the exhaust, but just with the chip and intake I gained MPG if I drive it the same. (It's almost exactly the same as before those mods if I am always in the throttle. Hopefully someone in here has an idea. I can see how that would be pretty frustrating...Have you tried putting the chip back to the #1 position (Factory tune) and see if it goes back up? It's an easy way to rule that out. Good luck.
-Aaron
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Old 02-24-2008, 04:49 PM
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I like that Ashley!!!! hahaha ^^^
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Old 02-24-2008, 04:51 PM
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Oh yeah, on a side note....Once you get it fixed, another thing to try is taking the line off your wastegate if you have gauges and can keep an eye on the boost. I gained gas mileage by taking the line off of my wastegate too. Just now I have to really keep my eyes on the boost gauge if I get on it...Hits 30psi QUICK.
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