The Ultimate MPG thread.
Junior Member
Joined: Mar 2018
Posts: 1
Likes: 1
MPG
I have a 2015 ford f150 v8 5.0. I have noticed a mpg issue with my truck and wonder if anyone else is experiencing this same issue. Basically the trip meter is registering less gas used than the pump when I fill up my truck. Say I pump 9 gallons of gas into my truck from the pump, my trip meter only indicates that I have used 8 gallons. Something seems off with this. I reset the trip meter at the same time I fill up the truck. So they should be matching imo.
Senior Member
Joined: Nov 2013
Posts: 2,965
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From: Euless, Tx
Yeah right. Mine always shows about one gallon used LESS than the fillup. Same as yours.
I would recommend remembering that when running low...Unless the tank holds a gallon more than advertised. Doubtful.
I would recommend remembering that when running low...Unless the tank holds a gallon more than advertised. Doubtful.
5 Year Member
Joined: Jul 2009
Posts: 701
Likes: 75
From: Kansas
2018 mpg vs wind
2018 Lariet FX4 5.0 3:31.
2015 Red SCab 5.0
Joined: Nov 2011
Posts: 267
Likes: 49
From: SE Wisconsin
I believe that there is a 1 gal. reserve in all gas tanks because the manufacturer does not want that tank to run totally dry...it will burn out the fuel pump necessary for the fuel injection system. Old days with a carb, it didn't matter--you just ran outta gas! Note: I'm no trained mechanic, this is what I've heard hanging around the garage.
5 Year Member
Joined: Sep 2017
Posts: 1,220
Likes: 454
From: Near Macomb, Illinois
A couple of thoughts on mpg. Wind resistance is based roughly on the square of your speed. So from 30 mph to 60 mph, the wind resistance isn’t twice as much but 4 times greater, and 9 time greater at 90 mph. Most vehicles will get better fuel mileage at about 45 mph, but that’s slow.
Every time you hit the brakes, you waste fuel. The sooner you let off of the gas coming to a red light or stop sign and coast the more fuel you save.
Every time you hit the brakes, you waste fuel. The sooner you let off of the gas coming to a red light or stop sign and coast the more fuel you save.
Senior Member
Joined: Sep 2017
Posts: 3,844
Likes: 39
I believe that there is a 1 gal. reserve in all gas tanks because the manufacturer does not want that tank to run totally dry...it will burn out the fuel pump necessary for the fuel injection system. Old days with a carb, it didn't matter--you just ran outta gas! Note: I'm no trained mechanic, this is what I've heard hanging around the garage.
A couple of thoughts on mpg. Wind resistance is based roughly on the square of your speed. So from 30 mph to 60 mph, the wind resistance isn’t twice as much but 4 times greater, and 9 time greater at 90 mph. Most vehicles will get better fuel mileage at about 45 mph, but that’s slow.
Every time you hit the brakes, you waste fuel. The sooner you let off of the gas coming to a red light or stop sign and coast the more fuel you save.
Every time you hit the brakes, you waste fuel. The sooner you let off of the gas coming to a red light or stop sign and coast the more fuel you save.
Senior Member
Joined: Oct 2017
Posts: 447
Likes: 138
From: Kansas
*I* think you have heard or misheard a whole bunch of BS. The diesel trucks have a pump that lives IN the tank and gets its lubrication from the fuel, but I doubt they took that approach with gas burners. Too risky. Just think about sparks when the tank is dry...
Yeah, it really irks my wife that I coast down to the stop rather than ride the binders so she can feel the deceleration. Too bad too sad Mary Ann...
Yeah, it really irks my wife that I coast down to the stop rather than ride the binders so she can feel the deceleration. Too bad too sad Mary Ann...
Senior Member
Joined: Dec 2017
Posts: 403
Likes: 58
From: Chattanooga, TN
20.2 mpg on the last tank full. About 80% highway. Big difference between steady state driving and the stop and go of city driving.
speeds, around 75 on the interstate, 70 in the 65 zones, maybe 7 over the rest of the time.
speeds, around 75 on the interstate, 70 in the 65 zones, maybe 7 over the rest of the time.
Junior Member
Joined: May 2017
Posts: 20
Likes: 2
truck has over 15k now and still shows 20.7 mpg
Hmmmmm I am new around here and was doing some research on a new F150 to replace my GMC 1500. Most of those MPG reports are pretty poor. I am currently driving a GMC Sierra Denali Ultimate 6.2 (420hp) 8 spd 1500 Crew Cab Std bed truck that has averaged 20.7 over the first 15k miles. I would expect no less from a Ford Truck especially with those little 6cyl engines?
Man I like Blue LOL got to get a Blue F150