Song: "My Best Friend's Girl"
Artist: Cars
Peak position on the Cashbox Singles chart: #44
Number of weeks on the Cashbox Singles chart: 13
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| October 28, 1978 | 88 | My Best Friend's Girl | Cars | Elektra 45537 |
| November 4, 1978 | 79 | My Best Friend's Girl | Cars | Elektra 45537 |
| November 11, 1978 | 72 | My Best Friend's Girl | Cars | Elektra 45537 |
| November 18, 1978 | 63 | My Best Friend's Girl | Cars | Elektra 45537 |
| November 25, 1978 | 57 | My Best Friend's Girl | Cars | Elektra 45537 |
| December 2, 1978 | 55 | My Best Friend's Girl | Cars | Elektra 45537 |
| December 9, 1978 | 53 | My Best Friend's Girl | Cars | Elektra 45537 |
| December 16, 1978 | 48 | My Best Friend's Girl | Cars | Elektra 45537 |
| December 23, 1978 | 46 | My Best Friend's Girl | Cars | Elektra 45537 |
| December 30, 1978 | 44 | My Best Friend's Girl | Cars | Elektra 45537 |
| January 13, 1979 | 64 | My Best Friend's Girl | Cars | Elektra 45537 |
| January 20, 1979 | 64 | My Best Friend's Girl | Cars | Elektra 45537 |
| January 27, 1979 | 91 | My Best Friend's Girl | Cars | Elektra 45537 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.