Standard tuning
Capo on 4th fret
You will only be picking the A, G, and B strings throughout the entire song.
Fingerpicking will make this much easier.
In any case, we will be playing the following:
Cadd9   Dsus2/A    Em7       Am        E        C       Em
e|-x-|   e|-x-|   e|-x-|   e|-x-|   e|-x-|   e|-x-|   e|-x-| 
B|-3-|   B|-3-|   B|-3-|   B|-1-|   B|-0-|   B|-1-|   B|-0-|
G|-0-|   G|-2-|   G|-0-|   G|-2-|   G|-1-|   G|-0-|   G|-0-|
D|-x-|   D|-x-|   D|-x-|   D|-x-|   D|-x-|   D|-x-|   D|-x-|
A|-3-|   A|-0-|   A|-2-|   A|-0-|   A|-2-|   A|-3-|   A|-2-|
E|-x-|   E|-x-|   E|-x-|   E|-x-|   E|-x-|   E|-x-|   E|-x-|
I tried to keep the chords lined up with the corresponding lyrics - let me know if anything is off!
Intro: Cadd9   Dsus2/A   Cadd9   Em7
Cadd9     Dsus2/A
And what do you mean? 
    Cadd9                Em7
Our hill's not all that steep 
          Cadd9             Em7
When the gauge reads half a tank 
            Am                   E
And yet you run on fumes for a week 
Dsus2/A            C           Em
And you and I, we once looked fine 
Dsus2/A              Am               E
Until you split your lip against the side of my face 
Dsus2/A          C                     Am 
So why do we bother with all this fighting?
                        E               Dsus2/A
And especially at our age 
(You'll have to listen to hear how he transitions from Dsus2/A to Cadd9 here)
Cadd9      Dsus2/A
And you never did 
Cadd9            Em7
Write down their names 
Cadd9                   Em7
So why break bones for them? 
    Am                   E
And blackened nights you rage 
Dsus2/A            C           Em
And you and I, we once looked great 
Dsus2/A           Am       E
And you and I, we sounded fine 
Dsus2/A           C                   Am
And you had hit notes, but also high carbs
                C                       Dsus2/A
I gave long stares, but I now take shorter steps
Cadd9           Dsus2/A
For after our accident 
Cadd9          Em7
we lost our no claims
Cadd9                         Em7
And now I hate those pastel shades
      Am                         E
That are just within my vision range
Dsus2/A            C           Em
And you and I, we once looked fine 
Dsus2/A              Am               E
Until you split your lip against the side of my face 
Dsus2/A          C                 Am 
So why do we bother with all this fighting?
                        E
And especially at our age 
Outro: Dsus2/A  Cadd9(x2) Em7(x2)
Have fun!