Home Forums Hunting & Shooting Hunter's Campfire Ford Lie-O-Meter Correction

I had a Chevy with that, my main current ride is a Subaru Forester. (go ahead, bring on the gay jokes...LOL)

The Chevy mileage calculator was about 10 % optimistic. Subtract about 10 % of the reading and you were in the ballpark.

Subaru is in the 5-8 % range over what is achieved in real life.

If the Chevy said 30 MPH, it was more like 27. Subaru says 36, more like 34 or thereabouts. Most people are too lazy to figure the real mileage out.
Not to mention there would be some variance between gas pumps. I drive like the old man that I am, so it doesn't really matter with the 45 miles I drive per day during the week.

There's a lot of variables in play and it's not surprising that calculated mpg differs a bit from actual mpg. A 6.7% error is not bad for the default setting. It's good that you can adjust the reading to make it a closer match. In order for Ford to get it closer, they'd have to do what you did; run a couple of tanks of gas through it, calculate actual MPG and then do the adjustment. Needless to say that's not practical for every vehicle they make with an MPG computer.

Ignore the computer and Google "internal combustion engine thermal efficiency."

I had two different Tundras, a 2007 with the 4.7L and a 2010 with the 5.7. With the exception of the same major problem on both of them, they were extremely reliable. Both had air injection pump and air injection valve problems. The ‘07 was covered under warranty but the ‘10 was past that coverage so I traded it in on the F-150. Only 7300 miles on the F-150 so far so I don’t really know anything about its reliability but I can say that the 3.5 Ecoboost has more balls than the 5.7 Tundra did and pulls noticeably harder and gets noticeably better fuel milage. So far, so good.

Back to the Tundra reliability. We’re it not for the air injection problems, I’d have nothing bad to say about them. Neither consumed or leaked a drop of fluids between oil changes all the way up to the 185,000 miles where I parted with them.

John

The mileage calculator in my 2014 with the 3.5 Ecoboost is accurate if you fill up, then drive on the freeway and get off and fill up again. It doesn't calculate in idling and winter warm ups.

Ron

I got a plain jane XLT -2013 3.7 and never seemed to sniff that >20 mpg as advertised. My current tires are a bit larger than factory so I am wondering what I really am getting?

BTW- I got Cooper MTP's that are ridiculously good in mud but as loud as they are good. Gonna have to change em out.

"My current tires are a bit larger than factory so I am wondering what I really am getting?'

Why didn't you have your speedo corrected when you got larger tires (or do it yourself)?

States sometimes have someone who goes around to verify that a gallon sold is actually a gallon...
They check what once a year?

Does calculating or reading it actually change anything? When it gets low you fill up. When it’s below zero you fill up at half a tank. Simple. Ed k

I have the baby eco-boost motor. Mine reads 19.4 MPG and my hand calc'd MPG is 19.2. So, it's either pretty accurate or someone did your steps already. I've tried to find reasons to not like this motor. But so far, I can't.

Correct.

Love your truck sir!!