Ford F-150 (2009-2014) :: 2010 Lariat Losing Fuel Mileage Suddenly
Oct 2, 2014
I have a 2010 F150 Supercrew 5.4 Lariat that just turned 100,000 miles that is losing fuel mileage all of a sudden... Over the years I'd get 16-17 mpg city and 18/19 highway(best I ever got was 20 mpg on a trip from New Orleans to Houston with cruise set on 65 all the way and no stops) always checked- tank vs miles, not on dash, and with every tank... I've changed all the plugs recently, did the BG Induction Service and BG Transmission service, K&N filter cleaned and recharged, about to do the MAP sensor cleaning also... I've dropped to 15-15.5 miles for the last two tanks...
Truck runs fine but maybe it's just me seems slightly sluggish when driving and accelerate to speed up quickly. Idles fine etc... I've just ordered a scanner for the computer, not that I have any codes YET...but I'm just trying to figure this out to get back to my normal mileage... Again no codes but what about the 02 sensors, they've never been changed... any other tweaks you knowledgeable folks can think of? Also ran Seafoam through the last two tanks... I pull a trailer from time to time... but not for a while... can the transmission get stuck in a lower setting since I'm told they "adjust" and need a few hundred miles to adjust back to non hauling?
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A week ago, I bought my wife a 2010 Platnium White Lariat. (I will post pics later, when it's clean). We noticed that the smell of fuel, was bad after driving it, and coming to a stop, say at a stop sign.
We returned it to our dealer, yesterday, and this what they found. Just though I'd pass it on to you, for problem shooting, and infor to ask a dealership.
This is the quote on the paper we have. "Customer states when filling up or at idle the can smell fuel in the passenger compartment. Smells like coming from the engine area. Leaking at fuel rail. Tightened valve and road test no leaks now".
We were told that it was a "schrader valve". There was NO CHARGE for this repair. So far it seems to be o.k.
The advise we were given was as follows:
1) NO HEET is needed in the fuel tank
2) No Sea Foam, or injector cleaner of any kind
REASON: Was told it would mess up gaskets, and seals etc. I'm not a mechanic, just passing the word that I was told.
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I have a 2010 Lariat and it randomly gives me fits by not letting me shift out of park. This started yesterday and I want to know where to start looking so I don't get stranded in BFE! Its a center console shifter.
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There I was driving down the road, minding my own business. My phone was charged full so I reached to disconnect the car charger and the tip fell off the charger and shorted out my cigarette lighter socket. My owners manual does not show where the fuse is located in the fuse box? It does not mention the "lighter fuse" by name......
I called the Ford Dealership parts department where I purchased my Lariat and was told I he could not nor would not tell me which fuse is blown. Everything else seems to work. Haven't tried my sync lately, better do that. Where the fuse is? My fuse box is inside engine compartment by the radiator.
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My wife's 2010 Lariat, has a problem with the heater switch. Its stuck in one speed.
Also the rear defogger switch doesn't light up. We don't know if the switch to it is just bad, OR if the whole system is bad.
Was also wondering if the blend door would be bad??
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I was wondering if one would experience increased fuel mileage &/or power with the 5.0 by using unleaded premium gas, and if so, how much? I know this is true w/ the 6.2L in the F-250, and was wondering if the same applied to the 5.0?
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I have a 2010 F150 4.6 3V... The power steering reservoir is constantly losing fluid. I've purchased the truck,used, a few months ago, bought a warranty. The dealership has had it multiple times now and can't find the leak. They just keep replacing hoses and the problem keeps occurring. Also worth noting, the truck has 6" lift with 35s. I've have also pulled the radiator cap and found a decent amount of what looks to be sludge/oil inside. Dealership says it's probably just bad coolant.
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Last time this truck did this, I replaced the #27 fuse and it started right up. This time, no such luck. It is EXTREMELY frustrating to pay this much money for a truck that you cant start. Btw, it has 38 miles until its on empty.. Any way that could be the cause if i am parked in my drive way which has a slight incline?
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I crashed my f-150 2010 and its all fixed but now I have to find the fuel pump reset which I can not find!!!
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I have a 2012 f150 stx 5.0 and I drive mostly city with a few highway miles. Why get this bad of gas mileage?
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My Steering wheel is losing the outer coating. is this been seen before?
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How much my mileage will suffer if I go with a 3:73 rearend instead of a 3:55 ? Towing and not towing ? Truck will be 2012 F150 4X4.
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I have 2011 f150 5.0 and looking to put a programmer on it to increase fuel mileage and fix speedometer for my bigger tires .
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My 2014 f250 4x4 crew cab with 6.2l gasser only gets about 7.5-8 mpg at 65 mph while pulling my 27' bumper pull travel trailer. I know that thing is basically a wall trapping the air but is there anything I can do to gain a couple mpg more? I can average about 15 mpg at 65 mph without the trailer on the highway.
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I had my the tires on my 2009 Prius rotated a while back. My car has 36,000 miles on it all on the original tires. It seems like my mileage dropped a bit since doing that. There are so many variables in mileage though, it is hard for me to pin it down to that. Could tire rotation affect my mileage?
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Well been playing with all the mode to see what they do and the one thing I have noticed is I get worst mileage under ECO Mode. Why it doing this.
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So, I was in Wash. State for a while this month and rented a Prius. I decided to check some mileage on mountain roads, and here's what I got. All of these are indicated by the computer, so they are probably 5% or so high. Unfortunately, I did not see either the maximum incline or average incline of these roads posted anywhere, so unless someone else knows them, these numbers are not worth too much scientifically:
UPHILL:
Going uphill on I-90 to Snoqualmie Pass from the West (from Seattle), at 70 mph (the speed limit), fairly steady, with a few decreases for traffic and curves: 18.6 mpg.
Going uphill on US 97 to Blewitt Pass from the north at 50 mph, also the speed limit: 27 mpg.
Going uphill on the Olympic National Park road to Hurricane Ridge, speed limit varying between 35 and 25, with a couple of sections as low as 15 mph: 22.1 mpg. (Maximum incline here might have been 6 or 7 percent).
On the Hurricane Ridge road, I reset the Trip Meter A about a mile from the top (interestingly both segments of the uphill trip registered 22.1).
DOWNHILL, mostly:
The Hurricane Ridge downhill produced an interesting number, because I didn't reset the thing at the top, so I had a mile of 22.1 mpg at the beginning. You go down for about 18 miles, losing about 5200 feet of altitude to nearly sea level (Strait of Juan de Fuca). We kept driving, and at 24.7 miles (so about 6 miles of driving near sea level), the mileage gauge still showed 99.9 mpg. (I took a picture, but it's too fuzzy to put in here.) It was a couple of more miles before I noticed that the trip mpg was down to about 91.
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Temps average maybe around 10-15F in the winter so mileage won't be great. Tires are up, grill is blocked. We're getting about 42-43 on the HSI which means about 40 mpg in reality (I've checked this many times and Toyota is off by 3 mpg on average in our car). But Mike in Maine shows up with a 60+ mpg in 15F temps, and I know my fellow Alaskan, Spiderman, is getting 50+ easily. My commute is more highway than stop and go. I don't use P&G but I'm very gentle with the go pedal. I feel that I should be getting closer to 50 here, even with the temps. Is this too much to ask? Maybe it is...
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I have 2600 miles on my 2012 mdl II. A month old. I have been averaging 47.5mpg since day one based on miles driven and gas put back in tank at each fill up. I have used only Mobil bottom 87 oct gas.Last fill up got me 48.2, very nice, then I filled up with mid grade 89 oct as it was all I could get then. The next day I was in the dealer for my 1000 mile checkup. when I got out my battery was down to 25%, okay no biggie. Then from there on out I notice my mpg changed alot. The comps used to read 49.1-50.1. Now it reads 42.2-44.1. I drive the same way and my 85 mile round trip to work hasn't changed. My first fill up since the dealer, got me 45.0 mpg. wow a big drop off.
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I commuted to LA 2-3x a week. The mileage on my car is now at 90k. I have had an average of 40 mpg since new, but suddenly it began to drop. We took it to our local Toyota dealer and was told it was most likely a cable that needed to be cleaned. That was $160. It didn't work.
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The humidity has an affect on my MPG. I noticed that my MPG went from 49 - 52 MPG down to 44 - 46 MPG when the heat & humidity started here in June. Yesterday a cold front came through and the humidity dropped. I filled my tank up and noticed my MPG is back up to 49 MPG, so the only thing that is different is the humidity. The cold & humidity does affect the MPG (approx 4 - 6 MPG).
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