The Los Angeles Lakers have the highest point differential per game played by a team in the playoffs, with 2.39.

which team has the highest average margin of victory for a postseason

Interpreted as:

Which team has the highest average margin of victory per game for a postseason?

TEAM	GP	DIFF/GP	DIFF	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF
Los Angeles Lakers	777	2.39	1,859	241.4	104.0	48.1	22.9	7.7	5.8	14.7	39.2	85.5	45.8	4.8	14.1	33.9	22.6	30.8	73.4	187,605	80,776	36,289	17,814	3,917	2,916	7,434	18,685
Boston Celtics	719	2.27	1,631	242.4	105.1	50.2	23.2	7.2	4.8	14.9	39.5	89.3	44.3	5.9	17.1	34.5	22.4	28.9	77.5	174,285	75,568	35,960	16,713	3,589	2,407	7,439	17,816
San Antonio Spurs	403	1.8	726	241.7	99.8	42.7	21.6	7.2	5.4	14.1	37.5	81.2	46.2	5.6	15.5	36.4	19.4	26.3	73.6	97,395	40,210	17,192	8,724	2,901	2,196	5,696	8,967
Golden State Warriors	384	1.79	689	241.1	105.4	50.7	22.8	8.6	5.6	15.1	39.7	91.9	43.2	10.7	28.8	36.9	20.3	27.4	73.9	92,585	40,471	18,087	8,738	2,100	1,364	3,696	9,370
Cleveland Cavaliers	234	1.6	374	241.5	98.4	41.7	20.6	6.9	4.9	13.8	36.1	79.6	45.3	7.3	20.4	35.6	19.5	26.0	74.9	56,510	23,014	9,760	4,830	1,618	1,139	3,237	4,978
Miami Heat	290	1.05	304	241.5	96.0	40.1	19.0	7.1	4.7	13.9	34.7	76.8	45.2	8.0	22.7	35.2	18.7	25.2	74.2	70,025	27,854	11,641	5,521	2,057	1,358	4,037	6,416
Chicago Bulls	349	1.04	363	242.2	97.6	43.2	21.8	7.8	4.7	14.2	37.1	82.6	44.9	4.7	13.9	33.9	19.6	26.0	75.4	84,535	34,079	15,070	7,613	2,488	1,497	4,516	8,216
Anderson Packers	8	0.75	6	240.0	75.5		15.8				24.8	85.5	28.9				26.0	34.6	75.1	1,920	604		126				251
Milwaukee Bucks	306	0.74	225	242.0	104.4	44.4	23.4	7.6	5.0	15.1	40.1	85.9	46.7	5.9	17.6	33.7	19.5	26.1	74.9	74,065	31,934	13,582	7,156	2,009	1,331	4,002	7,298
Sheboygan Red Skins	3	0.67	2	240.0	88.0		19.7				29.7	77.0	38.5				28.7	42.7	67.2	720	264		59				94
Detroit Pistons	370	0.36	133	241.6	96.1	45.4	20.6	6.8	4.9	13.8	35.8	82.7	43.3	4.0	12.0	33.4	21.6	28.9	74.5	89,400	35,551	16,625	7,616	1,975	1,405	3,981	9,174
Phoenix Suns	320	0.02	5	242.0	106.0	42.6	23.7	7.4	5.2	14.6	40.2	85.8	46.8	5.8	16.2	36.0	20.6	26.7	77.1	77,450	33,927	13,630	7,590	2,317	1,627	4,557	7,473
Indiana Pacers	241	-0.07	-17	241.3	93.4	40.6	19.6	7.0	4.6	14.8	33.5	76.0	44.0	6.1	17.2	35.6	20.4	26.7	76.5	58,165	22,521	9,780	4,718	1,698	1,100	3,572	5,733
Philadelphia 76ers	482	-0.18	-85	241.6	102.6	49.2	22.1	8.1	5.8	15.7	38.0	86.3	44.0	4.1	12.2	33.2	24.2	32.5	74.5	116,455	49,443	23,175	10,675	2,590	1,855	4,998	11,951
Oklahoma City Thunder	331	-0.24	-80	242.3	101.5	43.6	20.8	7.8	5.4	15.1	37.9	83.7	45.2	5.7	16.8	33.7	21.0	27.3	76.9	80,190	33,581	14,437	6,886	2,571	1,795	5,000	8,073
Houston Rockets	322	-0.44	-142	241.6	102.0	42.8	22.0	7.7	5.3	14.8	37.9	83.4	45.4	7.0	20.3	34.3	19.8	26.7	74.3	77,780	32,833	13,797	7,087	2,448	1,676	4,686	7,336
Utah Jazz	292	-0.68	-200	241.4	99.1	41.8	22.6	7.1	5.1	14.3	36.2	79.5	45.6	5.1	14.2	35.8	21.5	28.3	76.0	70,480	28,928	12,213	6,594	2,082	1,476	4,166	7,089
Baltimore Bullets	16	-0.81	-13	241.6	77.8	51.5	9.2				25.4	84.6	30.0				27.0	37.1	72.7	3,865	1,244	103	147				485
L.A. Clippers	147	-0.83	-122	241.0	104.7	41.8	21.3	7.5	4.8	13.8	39.0	83.9	46.5	8.6	24.0	35.7	19.4	26.1	74.4	35,430	15,397	6,143	3,134	1,101	705	2,029	3,440
New York Knicks	391	-1.06	-416	242.2	94.8	44.8	20.2	7.5	4.1	15.5	35.8	82.3	43.5	4.6	13.6	33.8	20.6	27.8	74.1	94,690	37,060	16,657	7,906	1,806	989	3,724	10,077
Orlando Magic	133	-1.08	-144	241.7	95.6	40.0	19.2	6.5	4.7	14.1	34.4	76.4	45.0	8.0	22.7	35.1	19.0	27.0	70.1	32,145	12,718	5,318	2,550	864	619	1,871	2,994
Dallas Mavericks	227	-1.39	-315	241.7	103.1	41.9	19.8	6.7	4.2	13.0	37.7	83.3	45.2	7.1	19.6	36.1	20.6	26.0	79.2	54,855	23,398	9,500	4,484	1,530	960	2,940	5,143
Washington Wizards	237	-1.39	-329	242.2	101.7	46.6	20.3	7.2	5.3	15.7	39.3	88.2	44.6	5.3	16.2	32.7	20.7	28.3	73.4	57,405	24,097	11,043	4,818	1,323	977	2,885	5,661
Toronto Raptors	123	-1.6	-197	242.0	98.9	40.7	20.5	7.3	4.5	13.0	35.9	81.9	43.9	8.7	25.7	34.0	18.3	23.2	78.9	29,770	12,164	5,007	2,516	904	555	1,602	2,770
Denver Nuggets	230	-1.85	-425	242.3	107.8	43.9	23.7	7.3	4.8	14.0	40.3	88.0	45.8	6.5	18.5	34.9	21.4	27.7	77.1	55,725	24,799	10,094	5,454	1,669	1,105	3,227	5,647