best goal differential by a team in a full 7 game playoff series

The New York Islanders have the highest goal differential by a team in a single NHL playoff run, with a differential of 49 goals in 1980-81.

	TEAM	DIFF	SEASON	GP	W	L	T	G	GA	PP%	PK%	S/GP	S%	SA/GP	SV%
1	Islanders	49	1980-81	18	15	3		97	48	37.8	80.2	30.28	17.8	27.06	.901
2	Oilers	41	1984-85	18	15	3		98	57			33.39	16.3	29.17	.891
3	Islanders	41	1982-83	20	15	5		94	53	24.7	87.0	32.60	14.4	30.30	.913
4	Oilers	38	1983-84	19	15	4		94	56	22.4	77.5	37.74	13.1	31.84	.907
5	Devils	33	1994-95	20	16	4		67	34	25.0	86.5	30.45	11.0	23.25	.927
6	Oilers	33	1989-90	22	16	6		93	60	21.2	85.7	27.73	15.2	30.59	.911
7	Islanders	33	1981-82	19	15	4		85	52			33.05	13.5	27.74	.901
8	Bruins	32	1969-70	14	12	2		65	33			34.14	13.6	30.36	.922
9	Golden Knights	31	2022-23	22	16	6		88	57	21.9	71.7	30.09	13.3	32.05	.919
10	Red Wings	31	2007-08	22	16	6		72	41	18.9	85.7	36.50	9.0	23.64	.921
11	Rangers	31	1993-94	23	16	7		81	50	21.2	91.3	33.43	10.5	27.83	.922
12	Oilers	31	1987-88	18	16	2	1	84	53	26.5	82.9	27.44	17.0	25.11	.883
13	Canadiens	31	1976-77	14	12	2		54	23			30.71	12.6	23.21	.929
14	Avalanche	30	2021-22	20	16	4		85	55	32.8	80.4	39.05	10.9	27.90	.901
15	Lightning	30	2020-21	23	16	7		75	45	32.4	84.1	29.57	11.0	30.43	.936
16	Oilers	30	1986-87	21	16	5		87	57	20.7	81.8	32.05	12.9	26.10	.896
17	Oilers	30	1982-83	16	11	5		80	50	19.4	75.7	32.44	15.4	29.19	.893
18	Bruins	30	1971-72	15	12	3		64	34			32.87	13.0	30.07	.925
19	Avalanche	29	1995-96	22	16	6		80	51	21.8	85.0	30.23	12.0	29.50	.921
20	Canadiens	29	1977-78	15	12	3		58	29	25.9	89.3	30.93	12.5	24.07	.920
21	Bruins	28	2018-19	24	15	9		79	51	32.4	88.4	32.63	10.1	31.00	.931
22	Bruins	28	2010-11	25	16	9		81	53	11.4	84.4	31.92	10.2	34.04	.938
23	Red Wings	28	2008-09	23	15	8		76	48	23.7	73.2	36.30	9.1	28.13	.926
24	Avalanche	28	2000-01	23	16	7		69	41	19.8	85.9	26.26	11.4	27.04	.934
25	Kings	27	2011-12	20	16	4		57	30	12.8	92.1	30.55	9.3	26.95	.944