Billy Mulek

I had a 2013 SCAB EB with 3.31 gear ratio. I needed to get a Super Crew for the room and I picked up a 2014 Supercrew EB 6.5 MAX TOW with 3.73 gear ratio. I live in Northern Minnesota and we are setting record up here for consecutive days below zero. (main reason I believe i have poor MPG) Prior to the start of winter I changed the oil in the 2013 and that's when I generally reset my MPG. I was getting 13.5 when I traded the truck in two weeks ago. With the new truck and with only 700 miles on it I am 13.0 - 13.1. I excepted the MPG to suffer in the new truck as it is bigger but I excepted worse than that. I guess what I am asking for does anyone have idea of what I should see long term from going for a 3.31 scab to a 3.73 screw in regards to MPG.

I am not complaining about the MPG or trying to start a debate about it as there are many threads already. I just curious if anyone else out there has experience in the two different set ups.

Zax

Mine probably doesn't apply but I do have 3.73 gears..just the 5.0 instead of the eco. We haven't been as cold as you at all, we are around 20-30* F. But I do have the same number of miles on my 5.0, i'm so far getting 15.6 mpg mixed driving. I don't know if this helps at all since it's not the same engine..but yeah..if it does good..if not..well shoot. lol

Cypress

I'm getting anywhere from 17-20 on the freeway on my '14 screw EB 4x2 w/ max tow package in socal. About 13-15 in the city, using cali 10% eth crap gas.

Wanted33

New engine, weather, more truck weight, and yes the 3.73's will use a little more gas because the rpm's are higher when your cruising. I wouldn't think the loss your seeing is out of the norm. Congrats on the new truck, it should be a monster pulling machine.


As an example I went from a 2wd 3.7L SCREW w/3.73 gears to a 2wd 5.0L SCREW w/3.31 gears and there isn't a thimble full of difference in the mpg's. I was surprised.

white08gt

in town driving you have a mechanical advantage to having 3.73s, will suffer a little bit more on the highway. lower gears makes it easier to take off.

zx12-iowa

Must be a lot of city driving. My Eco is at 17 mixed in minneapolis. Nearly as cold here.

04black150

I just bought my new '13 eco screw last week and I live in eastern nebraska. I've noticed I'm avg. around 14.8 with highway driving and driving in town all with a light foot(i live in rural neb). Its been -10-40 since I bought it last week. I feel you on the bad gas mileage, especially where the cold weather doesn't help. I have 3.31's in mine, so id say the weather along with breaking the engines over the next few months we will soon see the mpg's go up a tad! But I'm no expert lol

PawPaw

I bought my '13 3 week's ago and have the 3.31's with the Ecoboost. My first choice would have been the 3.73 or 3.55's to get the heavy truck rolling but I've been surprised with the low end torque how easily this engine accelerates. First two tank's I've averaged around 17.5 in combination driving untill I pulled my utility trailer behind it and mileage dropped into the 13-14 mpg range. Only have 1,100 miles on it now so it's got a way to go to probably get it best mileage. My son in law has a '13 Lariat 4x4 Screw with the 3.55's and I can't tell the difference in accelerating.

venatic

My mileage really varies because I'm not always driving without something behind me it seems. But, it's usually running around 14-15 mpg.

During the summer when I go out on some long drives, I easily get 19 mpg doing 65 mph.

DavidKR

my boss has a 2013 FX4 EcoBoost 6.5 max tow 3.73. he was averaging 17+ mixed driving with premium fuel (all stock truck with a tune) in the fall, but it's dropped down to the 12's throughout winter. I'm in Wisconsin so our climate is pretty similar. between cold starts and poor fuel quality the MPGs really do suffer greatly in the midwest winter months. my work van has been averaging around 7 compared to 11-12 in the summer.