The cols_merge_range() function

Use gtcars to create a gt table, keeping only the model, mpg_c, and mpg_h columns. Merge the "mpg*" columns together as a single range column (which is labeled as MPG, in italics) using the cols_merge_range() function.

gtcars |>
  dplyr::select(model, starts_with("mpg")) |>
  dplyr::slice(1:8) |>
  gt() |>
  cols_merge_range(
    col_begin = mpg_c,
    col_end = mpg_h
  ) |>
  cols_label(mpg_c = md("*MPG*"))

model	MPG
GT	11–18
458 Speciale	13–17
458 Spider	13–17
458 Italia	13–17
488 GTB	15–22
California	16–23
GTC4Lusso	12–17
FF	11–16