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  #1  
Old 12-18-2010, 05:19 PM
10RamFoose 10RamFoose is offline
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Default 35in tires and a working ECO???

I just bought a 2010 Ram crew cab with the 5.7L. I want to lift it about 4in and put 35in BFG All terrian tires on a 20 rim on it. My concern is that doing so will make the fuel saving system (eco) never kick on. Would that be the case? If so I might have to look into smaller tires. Whats the best approach?
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Old 12-18-2010, 06:22 PM
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With or without ECO, your mileage will drop with 35's. Plus, the 'all-terrain' never was worth much for MPG. (Great for a lot of things, but MPG ain't one of em!!!)

You may consider a gear change. ECO is not as HUGE a factor in MPG as some would like to believe. Yes, it helps, but it's not gonna get ya 10 MPG better,,, or 10 MPG worse,,,

Last edited by HoustonHemi; 12-18-2010 at 06:27 PM.
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Old 12-18-2010, 07:39 PM
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It should still work. Your RPM's won't jump that much!
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Old 12-19-2010, 06:36 PM
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CHADDER03 CHADDER03 is offline
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well im on 37's and my eco still works
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Old 12-20-2010, 02:05 PM
keithh2oskier keithh2oskier is offline
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On my 4.7 the Eco only comes on when light throttle is applied. I would estimate it at under 10%. I don't have cylinder deactivation like the hemi but I think the Eco is pretty worthless on my truck.

Are you referring to the cyl deactivation still working with 35s?
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