[MAGA2024_Chicago]

Guys I have a super well maintained 2010 v6 3.0 awd flex fuel that I bought a year ago with 120k miles for $3000. The previous owner took care of it well and when I bought it I did all the fluid changes exc. I love this car but it suck’s horribly on gas. It gives me about 180-200 miles per tank (regular unleaded) about 10-11 city and 11-13 on highway. What can I do to improve mpg on this. Thanks

 

[bangster]

Spark plugs, clean MAF, air filter, might be time for some o2 sensors, make sure no brakes are dragging, tires are properly inflated, not idling a lot, not being John Force from every stop light...

Unless you are using every little drop of fuel from your 17.5 gallons, you are probably getting even worse mileage unless you are also figuring it when you refill (went 200 miles, refilled with 16 gallons, that is 12 mpg), but within the same range.

 

[JohnCT]

My 05 has always sucked on gas mileage (AWD, V6) but sucks much worse in the winter. The "winter blend" has really wreaks havoc. For instance, I normally get about 17.5 mpg around town in the summer and about 250 miles of range - highway is maybe 22 if I peddle it easy. I know when they change the gas to winter blend because the next tank will drop by 50 miles at least. On winter blend, I get about 15 mpg.

Now, yours seems ridiculously bad, so I have to ask - are you actually tracking miles and gas between fillups or are you extrapolating how much gas used by "half a tank"?

John

 

[davez26]

Driving a 2010 3.0 with services up to speed.
I don't let stuff go, so plugs, MAF clean, filters, fuel cleaner once a year, etc all good.
Haven't needed o2.
According to the onboard, I get around 14.1 town, and 24 highway (65 mph avg, it goes down fast over that).
If I run E85, it's 12/17 give or take.
We are 6000' altitude so that brings it down a bit.
Maybe spot check this 'well maintained' to confirm as an easy first step if you haven't already.

Sent from my moto g power using Tapatalk

 

[Mountain Escape]

Driving a 2010 3.0 with services up to speed.
I don't let stuff go, so plugs, MAF clean, filters, fuel cleaner once a year, etc all good.
Haven't needed o2.
According to the onboard, I get around 14.1 town, and 24 highway (65 mph avg, it goes down fast over that).
If I run E85, it's 12/17 give or take.
We are 6000' altitude so that brings it down a bit.
Maybe spot check this 'well maintained' to confirm as an easy first step if you haven't already.

Sent from my moto g power using Tapatalk

how many miles you got? A restricted exhaust system/catalytic converter would have this effect.

I live at 10,000 feet, my numbers are higher than factory… Thinner air means you burn less fuel.

 

[Goomz]

Im having this same issue in my 08 v6 4wd, my on board says I am averaging 15.4 mpg. Im at 225,000 miles. I just bought the vehicle from a friends family member, which are mainly highway miles, about a year ago. When I first bought it, the onboard said 27 mpg! I was so happy. Im not sure how long the truck sat for, but the battery was not dead when I originally checked it out. The rapid decline in mpg made me do the plugs, (ngk) maf cleaning, dfpe egr pressure feedback sensor (motorcraft, I had a cel for that), fuel injection pressure sensor, (motorcraft) and im still looking at terrible mileage. Im going to change both upstream o2 sensors, but I doubt ill see a response. Since I got the code for the dfpe egr sensor, I was thinking maybe my egr valve is on its way out, but I dont have any issue with drivability except the car feels like it has no power. I figure its just a slow suv, its always been slow. doesn't feel like its choking or anything, just feels like 150hp in an suv. Good luck

 

[Linna]

From my experience, a Ford fuel trim technician will know why an engine is running rich without throwing a code. Might be cheaper to get a tech to figure out what is going on first, rather than throwing new parts at the problem and hope for a good result.

 

[Goomz]

From my experience, a Ford fuel trim technician will know why an engine is running rich without throwing a code. Might be cheaper to get a tech to figure out what is going on first, rather than throwing new parts at the problem and hope for a good result.

personally with my mileage, I’d assume my oxygen sensors are twice over in need of replacing. I’d imagine a mechanic with a snap on solus ultra scan tool would be cheaper than the dealership, but that’s a good option if all else fails in at least my case. Thanks for the input!