MYTH or FACT....

J

JCell

BEETEK!

:

2014 Genesis Coupe R-Spec

• Aug 15, 2004

• #1

Does filling your tank full makes the engine use less gas? a guy at work tells me yes, i say no
which is it?

 

O

osudewd

Member

:

2000 ES

• Aug 15, 2004

• #2

Why does he say that? Any logical reason? If any thing I would think the extra 10 gallons or so would weigh you down for less, although so little it would be unnoticable. I don't know for sure, but unless someone can give a logical explaination, I say myth.

 

M

mountjonas

Member

:

2013 VRM MS3

• Aug 15, 2004

• #3

osudewd said:

If any thing I would think the extra 10 gallons or so would weigh you down for less, although so little it would be unnoticable.

Click to expand...

that's what i'm thinking.

 

A

Aricjm15

Member

:

05 MSM

• Aug 15, 2004

• #4

I would say your buddy is a ******* tool

 

C

Caffein8d

Member

:

2008 Mazda3s 5-door

• Aug 15, 2004

• #5

Him = Wrong

 

L

lgagno1

Member

:

Mazda Protege5

• Aug 15, 2004

• #6

Him = right. But the difference would be very unnoticeable. For every 100lbs you add to a car, you lose about 1 mpg. So running with 4 gallons of gas opposed to 12 gallons or whatever would save you around 8 lbs per gallon of gas. So if you ran 4 instead of say 10, you would have around .5 more miles a gallon.

 

M

mountjonas

Member

:

2013 VRM MS3

• Aug 15, 2004

• #7

JCell said:

Does filling your tank full makes the engine use less gas? a guy at work tells me yes, i say no
which is it?

Click to expand...

lgagno1 said:

Him = right. But the difference would be very unnoticeable. For every 100lbs you add to a car, you lose about 1 mpg. So running with 4 gallons of gas opposed to 12 gallons or whatever would save you around 8 lbs per gallon of gas. So if you ran 4 instead of say 10, you would have around .5 more miles a gallon.

Click to expand...

(scratch)

 

U

uclap5

Member

Contributor

:

Big Blue Bus

• Aug 15, 2004

• #8

someone is confused.

 

M

Mr. Win

Member

Contributor

• Aug 15, 2004

• #9

Aricjm15 said:

I would say your buddy is a ******* tool

Click to expand...

ooh ooh me too (2thumbs)

 

D

dominoy2k1

Member

Contributor

:

02 1500 4x4, mp3

• Aug 15, 2004

• #10

lgagno1 said:

Him = right. But the difference would be very unnoticeable. For every 100lbs you add to a car, you lose about 1 mpg. So running with 4 gallons of gas opposed to 12 gallons or whatever would save you around 8 lbs per gallon of gas. So if you ran 4 instead of say 10, you would have around .5 more miles a gallon.

Click to expand...

so the answer is he is wrong?...my car is blue.(crazy)

 

R

RyanJayG

MP3 #1497

Contributor

:

Yellow MP3 #1497

• Aug 15, 2004

• #11

no, its yellow damn it, my car is YELLOW!!!!

 

M

Mikey444

Member

:

Mazda 3 & RX-8

• Aug 15, 2004

• #12

(mswerd)

 

R

redfyre

Member

:

2002 P5

• Aug 15, 2004

• #13

And if you drive your car backwards you actually get gas back...

 

S

SciFiMan

Member

:

2005 Tribute S

• Aug 15, 2004

• #14

uclap5 said:

someone is confused.

Click to expand...

No, he's right. I did the math using long division. So now I pull a 637 gallon tank on a trailer behind. I'm actually making gas now, and every couple days I siphon some off to use in the other car. I don't need the middle east now. Somebody quick tell Bush!

 

N

Newf

• Aug 15, 2004

• #15

you actually usually burn the 1st half tank faster then the last half due to the extra weight. Of course, this assuming you always drive with the same person in the car, and not carrying anything else from one week to the next, on the same roads, same speeds, same weather etc.

Killer is, the damn needles on most cars aren't accurate enough so you never know what your actually on E. Even between my MP3, and MSP there's a difference to where the light comes on.

 

D

dudeondacouch

Member

:

LegacyGT Wagon of Awesome

• Aug 15, 2004

• #16

SciFiMan said:

No, he's right. I did the math using long division. So now I pull a 637 gallon tank on a trailer behind. I'm actually making gas now, and every couple days I siphon some off to use in the other car. I don't need the middle east now. Somebody quick tell Bush!

Click to expand...

hahahahaahahahaha

 

K

Kooldino

MOTM Winner Jan '09

Authorized Vendor

Contributor

:

MP3

• Aug 15, 2004

• #17

Aricjm15 said:

I would say your buddy is a ******* tool

Click to expand...

QFT

 

M

Mikey444

Member

:

Mazda 3 & RX-8

• Aug 15, 2004

• #18

Aricjm15 said:

I would say your buddy is a ******* tool

Click to expand...

I concur

 

P

Pretzellogic

Member

Contributor

:

Das Pretzelwagon

• Aug 16, 2004

• #19

redfyre said:

And if you drive your car backwards you actually get gas back...

Click to expand...

SHHHHHH! Don't tell anyone. It's supposed to be a secret.

 

P

Puckpimp71

Member

:

1991 Taurus SHO, 2003 Black Mazdaspeed Protege

• Aug 16, 2004

• #20

I think it evens out from the first half to the second half. A full tank will obviously weigh more and require more energy to move it, but as the gas level lowers some condensation will form inside the tank (let a bottle of rubbing alcohol sit for a day or two in a warm area and you'll see what I'm talking about) and a bit of the water will get sucked up with the gas, hurting mileage. It's not that apparent in my MSP, but with my SHO, when I keep the gas level above 1/4 of tank as much as possible I get noticeably better mileage... about 20-30 more miles on the tank.