https://www.moxfield.com/decks/lYiq6VaOx0OtWQt4g5h73w
Either making it better, better card choice, etc. anything as I've never done a vehicle deck but love the idea of this
#Any Advice on my Greasefang deck?
hybrid rock
waxen barn
I think you want more draw/discard effects. The dream scenario of being able to play Greasefang on turn three with a juicy vehicle like Parhelion II in the graveyard already would be a lot easier if you had something like [[key to the city]] or [[collector's vault]] or [[poet's quill]].
I think these effects would likely make the list more consistent and could swap in instead of the less impactful nontoken pilots like Kitsune Ace or Aeronaut Admiral.
sullen surgeBOT
Artifact
, Discard a card: Up to one target creature can't be blocked this turn.
Whenever Key to the City becomes untapped, you may pay 
. If you do, draw a card.
It would be unfortunate if the key fell into the wrong hands.
Artifact
, : Draw a card, then discard a card. Create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")
Beluna makes a habit of "liberating" valuables from the world below, from priceless artifacts to historic buildings.
Artifact — Equipment
When Poet's Quill enters the battlefield, learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)
Equipped creature gets +1/+1 and has lifelink.
Equip 
hybrid rock
I think you want more draw/discard effects. The dream scenario of being able to ...
I added a crap ton more, had some before I seen you post this but have almost 10 sources of it now and a bit more draw sources