which mlb team had the best run differential per game season in the modern era

Since 1900, the New York Yankees have the highest run differential per game by a team in a season, with 2.7 in 1939.

	TEAM	DIFF/G	DIFF	G	SEASON	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Yankees	2.7	411	152	1939	.702	106	45	5,300	967	1,521	259	55	166	904	701	36	543	72	37	6,129	2,388	480	92			99	.287	.374	.451	.825
2	Yankees	2.39	371	155	1927	.714	110	44	5,354	976	1,644	291	103	158	907	642	22	610	90	64	6,222	2,615	552	204				.307	.384	.488	.872
3	Pirates	2.35	334	142	1902	.741	103	36	4,926	774	1,410	189	95	18	660	372	64	440	222		5,480	1,843	302	118				.286	.344	.374	.718
4	Dodgers	2.27	136	60	2020	.717	43	17	2,042	349	523	97	6	118	327	228	30	471	29	8	2,315	986	221	3	12	7	46	.256	.338	.483	.821
5	Yankees	2.15	334	155	1936	.667	102	51	5,591	1,065	1,676	315	83	182	997	700	33	593	77	40	6,391	2,703	580	67				.300	.381	.483	.864
6	Cubs	2.08	323	155	1906	.763	116	36	5,018	704	1,316	181	71	20	539	448	45	516	283		5,742	1,699	272	231				.262	.328	.339	.667
7	Dodgers	2.06	334	162	2022	.685	111	51	5,526	847	1,418	325	31	212	812	607	56	1,374	98	18	6,245	2,441	568	3	53	22	85	.257	.333	.442	.775
8	Yankees	1.98	307	155	1931	.614	94	59	5,608	1,067	1,667	276	78	155	990	750	28	554	139	68	6,473	2,564	509	87				.297	.383	.457	.840
9	Yankees	1.96	308	157	1937	.662	102	52	5,487	979	1,554	282	73	174	921	712	34	607	60	36	6,294	2,504	529	61				.283	.369	.456	.825
10	Yankees	1.91	294	154	1942	.669	103	51	5,305	801	1,429	223	57	108	744	591	29	556	69	33	6,009	2,090	388	84			103	.269	.346	.394	.740
11	Yankees	1.91	309	162	1998	.704	114	48	5,643	965	1,625	290	31	207	907	653	57	1,025	153	63	6,444	2,598	528	32	59	34	145	.288	.364	.460	.825
12	Athletics	1.89	285	151	1929	.693	104	46	5,204	901	1,537	288	75	122	845	540	29	440	63	42	5,987	2,341	485	214				.295	.365	.450	.815
13	Mariners	1.85	300	162	2001	.716	116	46	5,680	927	1,637	310	38	169	881	614	62	989	174	42	6,474	2,530	517	48	70	54	112	.288	.360	.445	.805
14	Tigers	1.8	63	35	2025	.629	22	13	1,183	179	302	46	6	47	174	125	15	312	15	2	1,336	501	99	4	9	3	19	.255	.332	.423	.755
15	Cardinals	1.8	282	157	1944	.682	105	49	5,474	772	1,507	274	59	100	722	543	27	471	37		6,168	2,199	433	124			96	.275	.344	.402	.745
16	Yankees	1.78	278	156	1932	.695	107	47	5,476	1,002	1,564	279	82	160	954	765	27	526	77	66	6,344	2,487	521	76				.286	.376	.454	.830
17	Cardinals	1.76	275	156	1942	.688	106	48	5,422	755	1,454	282	69	60	680	551	22	505	71		6,125	2,054	411	130			90	.268	.338	.379	.717
18	Giants	1.76	273	155	1905	.686	105	48	5,094	778	1,392	191	88	39	642	517	90	497	291		5,839	1,876	318	138				.273	.351	.368	.719
19	Indians	1.75	273	156	1948	.626	97	58	5,446	840	1,534	242	54	155	801	646	24	575	54	44	6,201	2,349	451	85			132	.282	.360	.431	.792
20	Pirates	1.74	243	140	1901	.647	90	49	4,913	777	1,407	182	92	29	636	386	52	497	203		5,468	1,860	303	117				.286	.345	.379	.723
21	Astros	1.73	280	162	2019	.660	107	55	5,613	920	1,538	323	28	288	891	645	66	1,166	67	27	6,391	2,781	639	10	57	17	146	.274	.352	.495	.848
22	Dodgers	1.72	266	155	1953	.682	105	49	5,373	955	1,529	274	59	208	887	655	35	686	90	47	6,138	2,545	541	75			115	.285	.366	.474	.840
23	Athletics	1.7	259	152	1911	.669	101	50	5,199	861	1,540	237	93	35	692	424	65	523	226		5,920	2,068	365	232				.296	.357	.398	.754
24	Giants	1.7	268	158	1904	.693	106	47	5,150	744	1,347	202	65	31	564	434	79	459	283		5,828	1,772	298	165				.262	.328	.344	.673
25	Dodgers	1.69	273	162	2019	.654	106	56	5,493	886	1,414	302	20	279	861	607	81	1,356	57	10	6,281	2,593	601	55	45	47	100	.257	.338	.472	.810