Killer GAS

Today's Puzzle:

Today's puzzle is an enjoyable puzzle, but possibly a misnomer (unless I really struggled) in that it's not GAS!

Link to Play Along:

Little Killer GAS No. 1 by Matt Johnson https://tinyurl.com/SudokuSleuthKillerGAS

Rules:

1. Normal Sudoku Rules Apply. 2. Digits cannot repeat along the indicated diagonals. 3. The clues outside the grid show the sum of the digits on that diagonal. 4. The X marks two digits that have a sum of 10.