Where did my MPG go?
11-10-2018, 05:25 PM
#1
Where did my MPG go?
Hi all! About 3 months ago I bought a 2017 F150 lariat with the 5.0 V8. The first three weeks I was getting 18.4 MPG. The following week I added tires and rims (33'" nitto ridge grappler), rousch cold air intake, and a flowmaster american thunder dual exhaust cat back system. For the last month I have been only averaging 15.2 MPG according to the trucks fuel economy screen. I understand that I will lose a little with the tires but I thought the CAI and the exhaust would have helped by letting the truck breathe. I'm hoping that a tune will fix this but my confidence isn't too high right now. Just yesterday I received my SCT BDX tuner and I'm waiting for my tune from OZ which I should get on Monday. Any input would be greatly appreciated. One question too, would it be helpful to disconnect the battery and let the truck "reset" due to all of the performance parts I added? Thanks.
11-10-2018, 07:09 PM
#2
Senior Member
Hi all! About 3 months ago I bought a 2017 F150 lariat with the 5.0 V8. The first three weeks I was getting 18.4 MPG. The following week I added tires and rims (33'" nitto ridge grappler), rousch cold air intake, and a flowmaster american thunder dual exhaust cat back system. For the last month I have been only averaging 15.2 MPG according to the trucks fuel economy screen. I understand that I will lose a little with the tires but I thought the CAI and the exhaust would have helped by letting the truck breathe. I'm hoping that a tune will fix this but my confidence isn't too high right now. Just yesterday I received my SCT BDX tuner and I'm waiting for my tune from OZ which I should get on Monday. Any input would be greatly appreciated. One question too, would it be helpful to disconnect the battery and let the truck "reset" due to all of the performance parts I added? Thanks.
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botacuss (11-11-2018)
11-10-2018, 07:19 PM
#3
I figured the tires and wheels would hurt me, but 3 mpg??? I was thinking maybe 1-1.5 MPG. The CAI was added first, and I noticed a little drop with that, which didn't make any sense to me. Then 3 days later, I added the tires and wheels followed by the exhaust the next day. I don't know, I'm still scratching my head over this.
11-10-2018, 07:29 PM
#4
I figured the tires and wheels would hurt me, but 3 mpg??? I was thinking maybe 1-1.5 MPG. The CAI was added first, and I noticed a little drop with that, which didn't make any sense to me. Then 3 days later, I added the tires and wheels followed by the exhaust the next day. I don't know, I'm still scratching my head over this.
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botacuss (11-11-2018)
11-10-2018, 07:34 PM
#5
Senior Member
The wheels and tires weight more - Take more power to turn them.
You also changed your gear ratio, which effects your shift points.
Like I said, that’s where your MPGs went.
You also changed your gear ratio, which effects your shift points.
Like I said, that’s where your MPGs went.
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botacuss (11-11-2018)
11-11-2018, 11:54 AM
#6
TOTM Sept. '18
iTrader: (1)
Did you re calibrate the speedo for the larger tires?
Mike
Mike
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botacuss (11-11-2018)
11-11-2018, 12:14 PM
#7
No I didn't. I figured the tune I ordered from OZ tuning would take care of that. I'll update the thread after I install the tune. Thanks for all of the info and replies. I'm hoping to get a little closer to 16.5-17 after the tune.
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11-11-2018, 12:22 PM
#8
TOTM Sept. '18
iTrader: (1)
Mike
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botacuss (11-11-2018)
11-17-2018, 12:17 PM
#9
Senior Member
The tune will help you some maybe 1-2 mpg but your best bet is to ultimately decide where you are going with the truck. If you for see in the future of running 35 inch tires and wheels then you need to go ahead and drop the money and have the truck re geared. Trust me it is money well spent. I am running Yukon 4:56 gears. If i had to do it over agin i would have run 4:10 gears the gearing is extremely short on the 1 to 2 shift, but its still cool to get rubber on the 1-2 shift at low speeds. But if its a daily driver then the 4:10s are more livable.
