Tire Pressure Indicator and Gas Mileage

Rapid Red

Well-Known Member
Joined
Nov 4, 2019
Threads
36
Messages
3,791
Reaction score
2,901
Location
Woodstock GA
First Name
Greg
Vehicle(s)
GT PP2 RaceRed Roush> Steeda> preformance
Vehicle Showcase
2
To start with gas station air pumps are notoriously inaccurate.
Tire pressure should be checked and adjusted on a completely cold tire.
Why would you set your pressure to 40 instead of what the label on the drivers door post lists?
And to mention the cheapest tire gauge is probably better than a SLIME air pressure gauge.


LMAO the cheap tire gauge did match the reading from the TPS

"Tire pressure should be checked cold tire." And the best way to do that, Ford Pass .

 
OP
OP
2015Pumpkin

2015Pumpkin

Active Member
Joined
Sep 12, 2021
Threads
2
Messages
37
Reaction score
23
Location
Titusville
First Name
Chad
Vehicle(s)
2015 Mustang
So a pretty accurate way to figure out your actual MPG. When you pull in to the gas station note how many miles you got on that tank. Then after you fill up take that number and divided it by the amount of gallons you just put in your tank. I.E. you traveled 227 miles, then topped off with 13.589 gallons. 227/13.589 = 16.704MPG.
Good old pencil to paper! LOL
 
OP
OP
2015Pumpkin

2015Pumpkin

Active Member
Joined
Sep 12, 2021
Threads
2
Messages
37
Reaction score
23
Location
Titusville
First Name
Chad
Vehicle(s)
2015 Mustang
What do you mean "supposedly" you inflated them to 40 psi?
Did you use a reliable handheld digital or analog tire pressure gauge?
Why did you set them to such a high pressure?
If you have the original TPMS sensors they are 6 years old and are entering the end of life window for their batteries.
First of all...I DIDNT say I SUPPOSEDLY inflated them to 40... I said PURPOSELY inflated the tires to 40.
I used an analog gauge. I inflated them to 40 JUST to see if the TPMS would also indicate that tire pressure...which it didnt. Lastly...I did not know that TPMS's have batteries...SO...thanks for that info. I will have to remember that when I take it in for the first oil change and tire rotate at the shop! Thanks!
 
OP
OP
2015Pumpkin

2015Pumpkin

Active Member
Joined
Sep 12, 2021
Threads
2
Messages
37
Reaction score
23
Location
Titusville
First Name
Chad
Vehicle(s)
2015 Mustang
To start with gas station air pumps are notoriously inaccurate.
Tire pressure should be checked and adjusted on a completely cold tire.
Why would you set your pressure to 40 instead of what the label on the drivers door post lists?
And to mention the cheapest tire gauge is probably better than a SLIME air pressure gauge.


LMAO the cheap tire gauge did match the reading from the TPS

"Tire pressure should be checked cold tire." And the best way to do that, Ford Pass .
Guess Ill be tossing the SLIME gauge into the circular file! AKA garbage can!! LOL
 

cactus_kid

Well-Known Member
Joined
Dec 6, 2013
Threads
93
Messages
2,596
Reaction score
2,122
Location
Big Bend Country, TX
First Name
Michael
Vehicle(s)
'21 GT (see sig)
Find a good digital. Just make sure the battery is fresh.
 

Zrussian13

Well-Known Member
Joined
Nov 16, 2018
Threads
17
Messages
1,002
Reaction score
589
Location
Phoenix
First Name
Chris
Vehicle(s)
2019 Mustang GT, 2018 Acura MDX
On my car...
Tpms reads low by a few lbs.

Mpg reads high by about 1mpg.
 

cactus_kid

Well-Known Member
Joined
Dec 6, 2013
Threads
93
Messages
2,596
Reaction score
2,122
Location
Big Bend Country, TX
First Name
Michael
Vehicle(s)
'21 GT (see sig)
Mine is pretty much spot on based on cold tp at startup.
 

ORRadtech

Well-Known Member
Joined
Sep 12, 2019
Threads
21
Messages
1,468
Reaction score
1,074
Location
Atlanta, Georgia
First Name
Dave
Vehicle(s)
18 Mustang EcoBoost convertible, 14 Ford Fusion SE
When I get a new car it's standard practice for me to manually figure MPG over several tanks and compare it to what the car's computer says. The car is almost always a mile or two higher than what's real.
 

JimC

Well-Known Member
Joined
Apr 26, 2013
Threads
2
Messages
283
Reaction score
245
Location
Howell MI
First Name
Jim
Vehicle(s)
2019 EcoBoost performance package coupe
Hand calculation is really just another estimate of mpg. Unless you are measuring how much gas you actually burned and replacing exactly that same amount, you are still only doing an estimate. Difference in temperature, flow rate on the pump, how high you fill the tank and fill pipe, or any back pressure is going to affect how much gas you put in the tank and affect your calculation as a result.
 

Bikeman315

Well-Known Member
Joined
Apr 12, 2015
Threads
370
Messages
14,265
Reaction score
19,180
Location
Myrtle Beach, SC
First Name
Ira
Vehicle(s)
2019 Mustang GT/CS, 2021 Volvo XC60
OP
OP
2015Pumpkin

2015Pumpkin

Active Member
Joined
Sep 12, 2021
Threads
2
Messages
37
Reaction score
23
Location
Titusville
First Name
Chad
Vehicle(s)
2015 Mustang
Hand calculation is really just another estimate of mpg. Unless you are measuring how much gas you actually burned and replacing exactly that same amount, you are still only doing an estimate. Difference in temperature, flow rate on the pump, how high you fill the tank and fill pipe, or any back pressure is going to affect how much gas you put in the tank and affect your calculation as a result.
Very true. Sometimes you might fill the tank till it almost runs out and the next you might cheat yourself by a gallon or a half. Good point!!
 

ORRadtech

Well-Known Member
Joined
Sep 12, 2019
Threads
21
Messages
1,468
Reaction score
1,074
Location
Atlanta, Georgia
First Name
Dave
Vehicle(s)
18 Mustang EcoBoost convertible, 14 Ford Fusion SE
Hand calculation is really just another estimate of mpg. Unless you are measuring how much gas you actually burned and replacing exactly that same amount, you are still only doing an estimate. Difference in temperature, flow rate on the pump, how high you fill the tank and fill pipe, or any back pressure is going to affect how much gas you put in the tank and affect your calculation as a result.
That's why I do it for several tanks in a row, sometimes for three or 4 months. It takes all the variables and averages them out.
Will it ever be perfectly accurate? No, but it is a good solid average.
 

 
19 - Diode Dynamics - 1
Top