The Boston Red Sox have 4.49 runs allowed per game pitched all-time.

	TEAM	R/G	R	G	SEASON	W%	W	L	GS	ERA	SO	CG	SHO	SV	IP	H	ER	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Americans	4.41	608	138	1901	.581	79	57	138	3.04	396	123	7	1	1217.0	1,178	411	33	294	40		5,026	12	2.93	2.17	1.35	0.24	7.9	5.8	1.21	.269	4.50	8.71
2	Americans	4.35	600	138	1902	.562	77	60	138	3.02	431	123	6	1	1238.0	1,217	416	27	326	40		5,092	16	3.13	2.37	1.32	0.20	8.5	6.4	1.25	.279	4.36	8.85
3	Americans	3.58	505	141	1903	.659	91	47	141	2.57	579	123	20	4	1255.0	1,142	358	23	269	36		5,027	18	4.15	1.93	2.15	0.16	11.5	5.4	1.12	.272	3.62	8.19
4	Americans	2.97	466	157	1904	.617	95	59	157	2.12	612	148	21	1	1406.0	1,208	331	31	233	29		5,448	22	3.92	1.49	2.63	0.20	11.2	4.3	1.02	.259	2.98	7.73
5	Americans	3.69	564	153	1905	.513	78	74	153	2.84	652	124	14	1	1356.1	1,198	428	33	292	43		5,352	25	4.33	1.94	2.23	0.22	12.2	5.5	1.10	.269	3.74	7.95
6	Americans	4.59	711	155	1906	.318	49	105	155	3.41	549	124	6	6	1382.0	1,360	524	37	285	42		5,553	26	3.58	1.86	1.93	0.24	9.9	5.1	1.19	.285	4.63	8.86
7	Americans	3.59	556	155	1907	.396	59	90	155	2.45	517	100	17	7	1414.0	1,222	385	22	337	39		5,570	24	3.29	2.14	1.53	0.14	9.3	6.1	1.10	.258	3.54	7.78
8	Red Sox	3.32	515	155	1908	.487	75	79	155	2.28	624	102	12	7	1380.1	1,200	349	18	364	46		5,471	41	4.07	2.37	1.71	0.12	11.4	6.7	1.13	.267	3.36	7.82
9	Red Sox	3.61	549	152	1909	.583	88	63	152	2.59	555	75	10	14	1360.0	1,213	392	18	384	47		5,425	31	3.67	2.54	1.45	0.12	10.2	7.1	1.17	.270	3.63	8.03
10	Red Sox	3.57	564	158	1910	.529	81	72	158	2.46	670	100	11	6	1428.0	1,236	390	30	414	45		5,712	32	4.22	2.61	1.62	0.19	11.7	7.2	1.16	.265	3.55	7.79
11	Red Sox	4.22	645	153	1911	.510	78	75	153	2.74	711	87	10	8	1351.2	1,309	412	21	473	48		5,513	32	4.73	3.15	1.50	0.14	12.9	8.6	1.32	.302	4.29	8.72
12	Red Sox	3.53	544	154	1912	.691	105	47	154	2.76	712	108	18	6	1362.0	1,243	417	18	385	35		5,442	20	4.70	2.54	1.85	0.12	13.1	7.1	1.20	.285	3.59	8.21
13	Red Sox	4.04	610	151	1913	.527	79	71	151	2.94	710	83	12	10	1358.1	1,323	444	6	442	32		5,522	29	4.70	2.93	1.61	0.04	12.9	8.0	1.30	.304	4.04	8.77
14	Red Sox	3.21	510	159	1914	.595	91	62	159	2.36	602	88	23	7	1427.1	1,207	375	18	393	32		5,541	22	3.80	2.48	1.53	0.11	10.9	7.1	1.12	.264	3.22	7.61
15	Red Sox	3.22	499	155	1915	.669	101	50	155	2.39	634	81	16	15	1397.0	1,164	371	18	446	46		5,522	29	4.08	2.87	1.42	0.12	11.5	8.1	1.15	.262	3.21	7.50
16	Red Sox	3.08	480	156	1916	.591	91	63	156	2.48	584	76	23	16	1410.2	1,221	388	10	463	38		5,601	26	3.73	2.95	1.26	0.06	10.4	8.3	1.19	.269	3.06	7.79
17	Red Sox	2.91	457	157	1917	.592	90	62	157	2.20	509	115	14	7	1421.1	1,197	347	12	413	51		5,639	29	3.22	2.62	1.23	0.08	9.0	7.3	1.13	.255	2.89	7.58
18	Red Sox	3.02	381	126	1918	.595	75	51	126	2.31	392	105	25	2	1120.0	931	287	9	380	31		4,557	29	3.15	3.05	1.03	0.07	8.6	8.3	1.17	.246	3.06	7.48
19	Red Sox	4	552	138	1919	.482	66	71	138	3.30	380	89	15	8	1221.1	1,249	448	16	421	28		4,983	36	2.80	3.10	0.90	0.12	7.6	8.4	1.37	.298	4.07	9.20
20	Red Sox	4.57	704	154	1920	.471	72	81	154	3.82	481	92	11	6	1395.1	1,481	592	39	461	27		5,801	33	3.10	2.97	1.04	0.25	8.3	7.9	1.39	.301	4.54	9.55
21	Red Sox	4.51	695	154	1921	.487	75	79	154	3.98	446	89	9	9	1364.1	1,521	604	53	452	41		5,924	15	2.94	2.98	0.99	0.35	7.5	7.6	1.45	.298	4.58	10.03
22	Red Sox	4.97	766	154	1922	.396	61	93	154	4.30	359	71	10	5	1373.1	1,508	656	48	503	43		6,037	28	2.35	3.30	0.71	0.31	5.9	8.3	1.46	.287	5.02	9.88
23	Red Sox	5.22	804	154	1923	.401	61	91	154	4.20	412	76	3	11	1372.0	1,534	640	48	520	68		6,013	28	2.70	3.41	0.79	0.31	6.9	8.6	1.50	.299	5.27	10.06
24	Red Sox	5.13	805	157	1924	.435	67	87	157	4.35	414	73	8	16	1391.1	1,563	673	43	523	63		6,203	22	2.68	3.38	0.79	0.28	6.7	8.4	1.50	.295	5.21	10.11
25	Red Sox	6.06	921	152	1925	.309	47	105	152	4.97	310	68	6	6	1326.2	1,615	732	67	510	39		6,025	14	2.10	3.46	0.61	0.45	5.1	8.5	1.60	.304	6.25	10.96
	Total	4.49	86,868	19,368		.518	9,987	9,298	19,368	3.93	99,750	5,916	912	3,168	172966.2	173,713	75,438	13,614	62,987	5,158	2,495	740,658	4,487	5.19	3.28	1.58	0.71	13.5	8.5	1.37	.286	4.52	9.04