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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 03-17-2011, 10:51 PM
polkat polkat is offline
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Question 180 degree thermostat = more mpg?

ok, so here's the deal, just purchased and installed the jet 180 degree thermostat and installed it. My truck before the new thermo avg 10-11 mpg city and if i am lucky 12-13 mpg highway, after the install my truck has been getting 17-18 mpg highway and 14-15 mpg city, is this typical or am i just got dumb luck? any advice please.
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Old 03-17-2011, 10:53 PM
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A cooler running engine is a more efficient engine but that's a pretty significant gain just for a thermostat temp change.
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Old 03-17-2011, 11:18 PM
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Quote:
Originally Posted by MADDOG View Post
A cooler running engine is a more efficient engine but that's a pretty significant gain just for a thermostat temp change.
Id agree w/ maddog. My guess is that your old was very bad and you just didnt know it possibly. Only thing that makes sense in my head.
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Old 03-18-2011, 07:41 AM
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i wish those numbers where true though, lol but i plan on putting one in for the performance side of it haha, mine seems to run under half anyway tho, 4.7L come stock with like a 190-195 t-stat?
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Old 03-18-2011, 03:02 PM
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that's what I thought too, today is the third day with it in and the mileage has went down a little, but not as bad as it was before. I am in the Air Force and drive to work about 15-20 miles each way to get to the base and the mileage on the highway was went down to about 16-17 mpg, and driving on the base it has went down to about 14 mpg since there is a lot of stop and go driving, but heck any improvement in mpg I'm happy with. Future mods are an SCT tuner from hemifever, power wire, electric transmission line pressure booster and eventually a fastman throttle body. Only mods I have now is a airraid cai and a paper weight TB spacer. Any comments on my future mod plans would be appriciated
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Old 03-18-2011, 04:23 PM
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I drive 27 miles each way to base, mostly hwy an mine gets 19-21 on the hwy and 16-18 city. you might want to see if you can change your driving and help any. i use cruise on the hwy.
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Old 03-19-2011, 06:52 PM
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i do use the cruise on the highway everyday, did fail to mention that the truck has 100k on the odometer and the wind up here in north dakota kills it on the mpg's as well. your truck USAF ram is a newer truck with more HP so that the engine doesn't have to work as hard as mine to push the truck down the road, so i can see where you better milage than me. But i'm trying to fix the power issue with some future mods. thanks for the input
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