Poor Mileage: Any ideas?

[Sugarphreak]

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[Deetz]

Larger tires, lift kit, cold weather= sounds normal to me

[Sugarphreak]

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[firebane]

Originally posted by Sugarphreak
^^ yeah, but I normally get 12~14L/100km even with all three of those factors considered

This is a 25~35% drop in mileage I can't figure out the reason for


I did start filling up at Co-op instead of Safeway this year though

Co-op doesn't use ethanol in their fuels which maybe your vehicle doesn't like.

[revelations]

Some of the obvious things:

- ignition plug condition and type
- condition of air filter (or mods)
- different supplier of gasoline (ethanol typically REDUCES mileage by 10%)
- wind conditions (zero wind to start, head wind on the way home)

[jonnycat]

Was it windy? Within 1 week my truck was 19l/100km on one trip and 16.3l the next week all because of wind

[Sugarphreak]

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[AE92_TreunoSC]

I believe you have Iridium plugs, they are good for 160,000kms, or at least 100,000, there is no need to replace them at 40,000kms regardless of your driving style.

Every inch you go up in tire size means larger turning weight, huge impact on fuel economy.

Every inch in ride height means a larger negative pressure zone under the vehicle which acts as drag even without a headwind.

That said I would try cleaning the MAF and throttle body, very common hindrance on any vehicle that has a MAF. Very gentile cleaning of both can go a long way. I actually clean them during a lot of routine maintenances at my job. Customers don't know it but I'm secretly helping them

http://www.hummer4x4offroad.com/foru...ensor-cleaning

[Tik-Tok]

Originally posted by firebane


Co-op doesn't use ethanol in their fuels which maybe your vehicle doesn't like.

All 87 octane fuel sold in Alberta has ethanol. It's government legislated for all gas sold to average 5%, which is why most brands put "up to" 10% in regular, and none in premium.

How fast were you driving Sugarphreak? The tests for highway driving is like 80km.h, you driving 120+ with short off-road gears makes for bad fuel economy.

[firebane]

Originally posted by Tik-Tok


All 87 octane fuel sold in Alberta has ethanol. It's government legislated for all gas sold to average 5%, which is why most brands put "up to" 10% in regular, and none in premium.

How fast were you driving Sugarphreak? The tests for highway driving is like 80km.h, you driving 120+ with short off-road gears makes for bad fuel economy.

Negative. Take a look at this:
http://pure-gas.org/index.jsp?stateprov=AB

[Sugarphreak]

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[Tik-Tok]

Originally posted by firebane


Negative. Take a look at this:
http://pure-gas.org/index.jsp?stateprov=AB

Yeah, some random dudes website is totally accurate

There is no such thing as ethanol free 87 octane road gas in Canada.

http://www.ec.gc.ca/energie-energy/d...n&n=BDB8F633-1

[r3ccOs]

f150 ecoboost screw w/ a lift & 35's? Do you run a tune?

I'm surprised you are averaging 10.7 on the highway with that configuration... thats better than me (I have 3.73 and running just moderately bigger 275/70/18) on the highway where I really see 11.2 going to Koocanusa & back

I guess its all the variables, such as Wind and Elevation, but I just reset the fuel economy gugage for a small trip to the NE today, driving stoney at the speed limit and I was averaging 15.6 @ -12c on a recent fillup of premium

think the biggest factor here is the weather... but if you do in fact did average much better at simular temps in years past... I'd definately change the plugs immediately

[Sugarphreak]

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[r3ccOs]

Originally posted by Sugarphreak
^^ Sorry, 10.9 is the rated... and I have gotten closer to 10 before I upsized the tires. I get 12~14 on average now.

It isn't boosted either, so the engine really struggles on the highway

what rear end gears do you run? I was always liked the look of a 35, but outside of looks, I haven't found the practicality... (i mean nobody really takes an 21 foot screw offroading) and it adversely affects towing and winter driveability (width of tire)

I know the plugs foul real fast, and was told by Rickdatuner that changing the plugs every 25k km was a good idea.

[firebane]

Originally posted by Sugarphreak
^^ Sorry, 10.9 is the rated... and I have gotten closer to 10 before I upsized the tires. I get 12~14 on average now.

It isn't boosted either, so the engine really struggles on the highway

You haven't said anywhere in here what gear ratio your running. With that truck and your setup if your not running a minimum of 4.10 gears that poor truck will be hating you.

[theken]

Winter fuel at the stations, I lose mileage every winter

[r3ccOs]

Originally posted by firebane


You haven't said anywhere in here what gear ratio your running. With that truck and your setup if your not running a minimum of 4.10 gears that poor truck will be hating you.

I'd almost agree... even the 6.2 runs 4.10's for the Raptor
Even though torque comes in "low" on the ecoboost, I just don't think anything less than the 3.73 is going to like highway speeds with that big and heavy of a tire

other option? Tune but with all I've been reading on f150 forums... I am thinking the stock tune is already quite optomized for durability

[raceman6135]

I'm not familiar with the kind of truck you drive, but could that trip possibly have been made in "full on 4 high, 4 wheel drive" instead of some sort of "automatic 4 wheel drive" or regular 2 wheel drive? My GMC Sierra will consume about 3 to 4 more litres per 100 km if I'm locked in 4H.

[Darell_n]

Originally posted by firebane


Negative. Take a look at this:
http://pure-gas.org/index.jsp?stateprov=AB

It is wrong.