MattCollins7

Ive had my 2012 Lariat with the 5.0 for a year now. When I first got it I was averaging 18-20mpg on the highway. I added a flowmaster 44 and gained 1 mpg. I leveled it and mpg remained unaffected. I put on BF Goodrich K02's (275/70/18), and mpg lost around 2mpg on the highway putting me around 17-18mpg average. Since then I have changed nothing else but my mileage now is averaging 14ish highway. I installed a K&N CIA hoping for some improvement but only gained about .5mpg. Whats going on with my truck and why did the MPG drop so drastically?? Any tips on regaining my MPG?

hmbjohn

I lost 2 mpg when I added a level and 275/70/18 Toyo Open Country AT's, I get 14-15mpg in town and 18mpg doing 65mph or 16mph doing 70-75mph. Heavy tires and driving above 65mph will KILL your MPG's.

I drive a 2014 eco BTW

Brokemillwright

Recently mine did the same, basically 14 mpg however I drove for 7 tanks. Winter fuel didn't matter last year. I think my front calipers had been hanging up but ford says all was good-even with purple rings around the front rotors.. Took it in for its 30k service and my mpg came back.

jrs442

Have you checked your air cleaner? DIrty air clieaner will impact MPG

MattCollins7

I just replaced the stock intake with a K&N cold air intake. Maybe I need to have to 30k servicing done.. I just hit 31k on the truck yesterday.

safetypin

what all comes with a 30k servicing?

RLXXI

Oil change, tire rotation and



.

safetypin

I can't tell what the picture is!


If it's an oil change and tire rotation - that 30k service sounds like a nice way to make routine maintenance sound incredibly important!


I just looked at what those services are, and it's basically a $400 oil change with an "inspection" - a complete package that is available at Jiffy Lube for maybe $40.


The number of teeth in the tech's mouth might differ, but it doesn't look like the work done will change.




1. Muffler and CAI might mess with your mileage if mechanical flow properties are messed with. I don't know.
2. Heavy tires might be your culprit.
3. Your truck probably sounds way cooler with the CAI and muffler, so your driving might have changed to a style that lets you hear more.
4. You spend too much time idling at Tachi Palace

MattCollins7

30,000 Maint. items:

Change engine oil and replace oil filter.
Inspect tires for wear and rotate.
Inspect brake pads/shoes/rotors/drums, brake
lines & hoses, and parking brake system.
Inspect wheel ends for endplay and noise.
Inspect engine cooling system and hoses.
Inspect exhaust system and heat shields.
Inspect steering linkage, ball joints, suspension
and, if equipped, halfshafts, driveshaft and U-joints.
Replace engine air filter.
Replace fuel filter (see page 47).
Replace cabin air filter, if equipped.
Change automatic transmission fluid on vehicles
equipped with the Torqshift transmission. Replace
the remote filter element on the vehicles
equipped with the Torqshift transmission. Inspect
automatic transmission/transaxle fluid level
on all other vehicles, if equipped with dipstick.
Consult your dealer for your particular
requirements.
Replace climate-controlled seat filters if equipped
(Navigator and Expedition).
Lubricate ball joints and steering linkage if
equipped with zerk fittings.
Inspect and lubricate 4X4 front axle shaft U-joints
(F250/350/450/550).
Multi-point inspection (recommended)

Multi-point inspection items:

Check and top up fluid levels:
brake
coolant recovery reservoir
manual and automatic transmission
(if equipped with a dipstick)
power steering
window washer
Inspect tires for wear and check air pressure, including spare.
Check exhaust system for leaks, damage, loose parts and foreign material.
Check battery performance.
Check operation of horn, exterior lamps, turn signals and hazard warning lights.
Check radiator, coolers, heater and air conditioning hoses.
Inspect windshield washer spray and wiper operation.
Check windshield for cracks, chips and pitting.
Inspect for oil and fluid leaks.
Inspect engine air filter.
Inspect half shaft dust boots, if equipped.
Check shocks and struts and other suspension components for leaks and damage.
Inspect steering and linkage.
Inspect accessory drive belt(s).
Inspect clutch operation, if equipped.

safetypin

The bolded areas are "work". The rest is eyeballing stuff.


If you aren't blind and can change your own oil and reset the oil life calculator, you can do your own 30k service and save $500.