Puzzle

 ACROSS

  1 Poor fig. for a gas-guzzler

  4 Popular tablet

  8 Summer skin shades

 12 ___ tai

 13 Singer Braxton

 14 "Until next time!"

 16 "M*A*S*H" star (theme hint: note the letter above every black square in each four-black square diagonal!)

 18 Eye part with 58-Across and cones

 19 Taken together

 20 Pinot ___ (white wine)

 22 Yoga surface

 23 Houston athlete

 24 Site of the patella

 25 Hats in Glasgow

 26 Not fem. or neut.

 27 A door's may contain a lock

 28 NASCAR great Yarborough

 29 Honorary poem

 30 Brings before a judge

 31 Peanut and sesame

 32 Love letter words often written as an acronym

 37 Dorothy's dog

 38 What a hand rocked back and forth might mean

 39 End of the world?

 40 "Quiet!"

 41 Paintballs, e.g.

 42 Usually buggy version

 43 "Star" or "Storage" follower

 44 Bouncer's workplace

 45 Capital of Senegal

 46 Sign abbr. before a year

 47 Bleachers level

 48 Shoot for the stars

 49 Crunchy bit in a brownie, perhaps

 51 One on the wrong side of the law?

 54 Comment from one who's coping

 55 Singer Brickell

 56 Penn of films

 57 Munch on a snack

 58 See 18-Across

 59 Crafty

DOWN

  1 Cage fighting, for short

  2 Fort fortification

  3 Large marine reptiles

  4 Writer Calvino

  5 Opinion survey

  6 &

  7 Former crime drama starring Dick Van Dyke

  8 Vietnamese New Year

  9 Donkey in "Shrek" and others

 10 Far from famous

 11 Crushes, as a fly

 14 Spreadable cheese

 15 Word necessary for consent

 17 Buster?

 21 WNBA stat hidden in "scoreboard"

 23 Songwriter Tori

 24 Didn't just suspect

 25 Have a heart-to-heart, maybe

 27 Bit of praise

 28 "Later!"

 30 MacFarlane or Rogen

 31 Too, too

 33 Disappointing game result

 34 Mummy's place

 35 Give oneself an objective

 36 Char

 40 Attempts, with "at"

 41 American pale ___

 42 One in a high chair

 43 "Victory is ours!"

 44 Commute destination, often

 45 Lavishes love (on)

 47 Spot for a soak

 48 Crossword part

 50 Undefined degree

 52 Wedding words

 53 Paper towel layer

Solution