Funny story... I did the same thing driving my 40 to Florida to see
@cruisermatt ... realized at the 3rd and final gas stop after I filled up that I couldn't find where I put the cap... thought about it, talked to 2 friends (both more mechanically inclined that I) and both said... "it'll be fine, just don't fill it up all the way..." which of course was impossible bc I just discovered it AFTER I filled it up all the way... anyway, between the pending heat stroke and the white knuckle driving on the interstate for 6 hours, I said F-IT... apparently I likely drove off from the last gas station without it (I'm 95% sure I left it on top of the tire when I was pumping gas), and I didn't catch on fire... #fullsend