MPG lie-ometer
Member
Joined: Aug 2015
Posts: 60
Likes: 7
One thought... even being that the LOM is usually 6% off, have you re calibrated your speedometer after going to the 35 inch tires? That will also cause your trip odometer to under report distance traveled.
Going to 35s from 31s or 32s, when you think you're driving 75 you're actually somewhere in the 80's, thus reporting less mileage and affecting your mpg calc.
Going to 35s from 31s or 32s, when you think you're driving 75 you're actually somewhere in the 80's, thus reporting less mileage and affecting your mpg calc.
Adventurer
Joined: Feb 2016
Posts: 39
Likes: 12
From: Woodinville, WA
Just did a 9K mile road trip. The LOM was off initially by over .6mpg but with my larger tire size installed, the errors canceled and now reads within .2mpg, calibrated against GPS. Every fill up logged, overall very consistent. With a popup camper loaded I lose 3-4mpg driving 55 vs 75 due to wind.
Senior Member
Joined: Jul 2015
Posts: 552
Likes: 109
From: Central Indiana
My truck is stock. This morning my truck took 31.2 gallons to fill while the lie-o-meter indicated only 28.1 gallons was used. Total mileage was 512 miles. Showed about 2mpg better than I actually got.
5 Year Member
Joined: Dec 2012
Posts: 1,455
Likes: 277
From: In way too hot southern Georgia
Everyone, you do realize Ford says this will give you an ESTIMATED mpg.
If this really bugs you consider this, the FDA allows the meters which diabetics use to measure blood sugar only have to be accurate to within +/- 20%. This is a medical device which can lead to using the wrong amount of insulin (life threatening).
So this really is nothing to worry or go crazy about.
If this really bugs you consider this, the FDA allows the meters which diabetics use to measure blood sugar only have to be accurate to within +/- 20%. This is a medical device which can lead to using the wrong amount of insulin (life threatening).
So this really is nothing to worry or go crazy about.
Last edited by Ifallsguy; Jun 23, 2016 at 09:10 AM.
Junior Member
Joined: Jun 2016
Posts: 18
Likes: 1
Lie o meter
I logged 8 consecutive tanks, 227 gallons, and the lie-o-meter's reported gallons used was low (and mpg calculated from same was high) by 5 to 9 percent per tank with an average error of 6.5 percent.
Even correcting for the reporting error it's still doing better than I'd expected.
Even correcting for the reporting error it's still doing better than I'd expected.
When I got the truck (exactly one year ago today-13,103 miles) all I could do was stare at the lie-o-meter and try to get better MPGs. I've never reset my trip 1 and it stays between 21.3 and 21.5. Pen and paper its more than 20.
With what I've done to the truck, I'm happy. Now all I have on that screen is MPH and I occasionally check tire pressure. I just drive.
5 Year Member
Joined: Sep 2015
Posts: 2,005
Likes: 1,380
Everyone, you do realize Ford says this will give you an ESTIMATED mpg.
If this really bugs you consider this, the FDA allows the meters which diabetics use to measure blood sugar only have to be accurate to within +/- 20%. This is a medical device which can lead to using the wrong amount of insulin (life threatening).
So this really is nothing to worry to go crazy about.
If this really bugs you consider this, the FDA allows the meters which diabetics use to measure blood sugar only have to be accurate to within +/- 20%. This is a medical device which can lead to using the wrong amount of insulin (life threatening).
So this really is nothing to worry to go crazy about.
You're joking right?
No fart cans allowed
Joined: Mar 2016
Posts: 4,341
Likes: 2,366
From: MO
My past experience has been the same; they have all been very close to actual hand calculated mileage - within 0.5 mpg at most. I haven't checked the truck yet but really expect to find the same.