The Montreal Canadiens have the highest goal differential per game played by a team in a season, with 2.7 in 1976-77.

which team has the highest margin of victory per game in a season

TEAM	GP	DIFF/GP	DIFF	SEASON	W	L	T	OTL	PTS	PTS%	G	GA	PP%	PK%	S/GP	SA/GP
Montreal Canadiens	80	2.7	216	1976-77	60	8	12		132	.825	387	171			35.19	25.63
Montreal Canadiens	50	2.5	125	1943-44	38	5	7		83	.830	234	109
Boston Bruins	78	2.46	192	1970-71	57	14	7		121	.776	399	207			40.59	31.26
Ottawa Senators	24	2.38	57	1919-20	19	5	0		38	.792	121	64
Montreal Canadiens	80	2.2	176	1977-78	59	10	11		129	.806	359	183	31.9	81.0	32.76	25.94
Montreal Canadiens	50	2.14	107	1944-45	38	8	4		80	.800	228	121
Montreal Canadiens	80	2.04	163	1975-76	58	11	11		127	.794	337	174			34.16	27.38
Montreal Canadiens	80	1.86	149	1974-75	47	14	19		113	.706	374	225			31.91	28.44
Montreal Canadiens	78	1.86	145	1972-73	52	10	16		120	.769	329	184			32.01	29.92
Boston Bruins	44	1.84	81	1929-30	38	5	1		77	.875	179	98
New York Islanders	80	1.8	144	1978-79	51	15	14		116	.725	358	214	31.2	80.2	28.76	28.86
Detroit Red Wings	82	1.76	144	1995-96	62	13	7		131	.799	325	181	21.3	88.3	32.29	24.17
Philadelphia Flyers	80	1.74	139	1975-76	51	13	16		118	.738	348	209			37.46	27.78
Montreal Canadiens	80	1.71	137	1981-82	46	17	17		109	.681	360	223	24.2	80.1	33.78	27.48
New York Islanders	80	1.69	135	1981-82	54	16	10		118	.738	385	250	27.8	79.9	30.86	30.08
Boston Bruins	48	1.67	80	1938-39	36	10	2		74	.771	156	76
Montreal Canadiens	80	1.66	133	1978-79	52	17	11		115	.719	337	204	28.3	83.6	32.16	25.41
Edmonton Oilers	80	1.65	132	1983-84	57	18	5		119	.744	446	314	25.5	79.7	32.64	33.01
Boston Bruins	78	1.64	128	1973-74	52	17	9		113	.724	349	221			33.96	29.31
Boston Bruins	78	1.62	126	1971-72	54	13	11		119	.763	330	204			33.76	29.12
New York Rangers	78	1.6	125	1971-72	48	17	13		109	.699	317	192			36.04	25.86
Calgary Flames	80	1.6	128	1988-89	54	17	9		117	.731	354	226	25.2	82.8	34.64	25.74
New York Islanders	80	1.55	124	1977-78	48	17	15		111	.694	334	210	31.4	83.5	31.13	28.20
Boston Bruins	82	1.55	127	2022-23	65	12		5	135	.823	301	174	22.2	87.3	32.98	29.84
Montreal Canadiens	44	1.55	68	1927-28	26	11	7		59	.670	116	48