180 degree thermostat effect of mpg

[*tim*]

Before i was running cheap 87 octane gas and getting 15-16mpg then I installed electric fan, 180 degree thermostat and tuner with hemifever tune with 91 octane gas and gas milage didn't change or maybe a little worse

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[Paluby]

I didn't do a very good comparison of before. Are you a Crew cab?

 

[*tim*]

Yeah

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[Hemi450hp]

Mileage does drop a bit with a cooler tstat. Is the MDS turned off in your new tuning? That could very well be the cause of the mileage drop as well.

 

[*tim*]

Mds is still on

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[StoneDude76]

Where you looking for better mpg's? If so those are not really the mods to have. I average 15-16 mpg. I have the 170*thermostat, Vararam intake,Hemifever93 tune,clutch fan delete, active grill shutters delete,catch can, and a flowmaster 50hd series muffler.

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[*tim*]

Where you looking for better mpg's? If so those are not really the mods to have. I average 15-16 mpg. I have the 170*thermostat, Vararam intake,Hemifever93 tune,clutch fan delete, active grill shutters delete,catch can, and a flowmaster 50hd series muffler.

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Were about the same on mods and I do the mods for fun factor. i just try to justify the money by telling myself I'll get better gas milage.

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[BlownGP]

You drop about a 1mpg with a colder thermostat.

I've lucky to get 14mpg but that's all city and I have the 5 speed.

 

[StoneDude76]

Just justify it by beating F150 light to light

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[*tim*]

I'm still debating going back to stock thermostat. If I gain 1-2 mpg how much power will I loose? I don't have limited slip rear end and don't race so it's kinda a waste

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