The Oakland Athletics have 3.97 earned runs per game pitched all-time.

	TEAM	ER/G	ER	G	SEASON	W%	W	L	GS	ERA	SO	CG	SHO	SV	IP	H	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Athletics	2.92	476	163	1968	.506	82	80	163	2.94	997	45	15	30	1455.2	1,220	544	124	505	31	78	6,009	55	6.16	3.12	1.97	0.77	16.6	8.4	1.19	.252	3.36	7.54
2	Athletics	3.77	611	162	1969	.543	88	74	162	3.71	887	42	11	36	1480.2	1,356	678	163	586	39	48	6,244	55	5.39	3.56	1.51	0.99	14.2	9.4	1.31	.261	4.12	8.24
3	Athletics	3.27	529	162	1970	.549	89	73	162	3.30	858	33	11	40	1442.2	1,253	593	134	542	34	45	6,029	56	5.35	3.38	1.58	0.84	14.2	9.0	1.24	.251	3.70	7.82
4	Athletics	3.09	498	161	1971	.627	101	60	161	3.05	999	57	15	36	1469.1	1,229	564	131	501	33	57	6,018	37	6.12	3.07	1.99	0.80	16.6	8.3	1.18	.252	3.45	7.53
5	Athletics	2.62	406	155	1972	.600	93	62	155	2.58	862	42	15	43	1417.2	1,170	457	96	418	19	41	5,718	29	5.47	2.65	2.06	0.61	15.1	7.3	1.12	.248	2.90	7.43
6	Athletics	3.28	532	162	1973	.580	94	68	162	3.29	797	46	12	41	1457.1	1,311	615	143	494	30	27	6,048	52	4.92	3.05	1.61	0.88	13.2	8.2	1.24	.255	3.80	8.10
7	Athletics	2.91	472	162	1974	.556	90	72	162	2.95	755	49	11	28	1439.2	1,322	551	90	430	25	41	5,937	27	4.72	2.69	1.76	0.56	12.7	7.2	1.22	.266	3.44	8.26
8	Athletics	3.25	526	162	1975	.605	98	64	162	3.27	784	36	7	44	1448.0	1,267	606	102	523	37	41	6,039	47	4.87	3.25	1.50	0.63	13.0	8.7	1.24	.254	3.77	7.88
9	Athletics	3.28	528	161	1976	.540	87	74	161	3.26	711	39	13	29	1459.1	1,412	598	96	415	30	34	6,108	40	4.38	2.56	1.71	0.59	11.6	6.8	1.25	.271	3.69	8.71
10	Athletics	4.01	645	161	1977	.391	63	98	161	4.04	788	32	3	26	1436.2	1,459	749	145	560	24	49	6,201	55	4.94	3.51	1.41	0.91	12.7	9.0	1.41	.281	4.69	9.14
11	Athletics	3.56	577	162	1978	.426	69	93	162	3.62	750	26	6	29	1433.1	1,401	690	106	582	26	59	6,171	37	4.71	3.65	1.29	0.67	12.2	9.4	1.38	.275	4.33	8.80
12	Athletics	4.65	754	162	1979	.333	54	108	162	4.75	726	41	3	20	1429.1	1,606	860	147	654	49	67	6,436	72	4.57	4.12	1.11	0.93	11.3	10.2	1.58	.300	5.42	10.11
13	Athletics	3.49	566	162	1980	.512	83	79	162	3.46	769	94	8	13	1471.2	1,347	642	142	521	31	29	6,175	51	4.70	3.19	1.48	0.87	12.5	8.4	1.27	.256	3.93	8.24
14	Athletics	3.34	364	109	1981	.587	64	45	109	3.30	505	60	11	10	993.0	883	403	80	370	28	17	4,166	30	4.58	3.35	1.36	0.73	12.1	8.9	1.26	.252	3.65	8.00
15	Athletics	4.54	735	162	1982	.420	68	94	162	4.54	697	42	5	22	1456.0	1,506	819	177	648	30	21	6,430	58	4.31	4.01	1.08	1.09	10.8	10.1	1.48	.272	5.06	9.31
16	Athletics	4.33	702	162	1983	.457	74	88	162	4.34	719	22	7	33	1454.1	1,462	782	135	626	31	44	6,340	43	4.45	3.87	1.15	0.84	11.3	9.9	1.44	.275	4.84	9.05
17	Athletics	4.4	712	162	1984	.475	77	85	162	4.48	695	15	2	44	1430.0	1,554	796	155	592	35	34	6,315	47	4.37	3.73	1.17	0.98	11.0	9.4	1.50	.289	5.01	9.78
18	Athletics	4.4	712	162	1985	.475	77	85	162	4.41	785	10	1	41	1453.0	1,451	787	172	607	25	32	6,327	48	4.86	3.76	1.29	1.07	12.4	9.6	1.42	.270	4.87	8.99
19	Athletics	4.23	686	162	1986	.469	76	86	162	4.31	937	22	4	37	1433.0	1,334	760	166	667	34	35	6,208	62	5.88	4.19	1.40	1.04	15.1	10.7	1.40	.265	4.77	8.38
20	Athletics	4.28	694	162	1987	.500	81	81	162	4.32	1,042	18	2	40	1445.2	1,442	789	176	531	36	21	6,238	52	6.49	3.31	1.96	1.10	16.7	8.5	1.36	.284	4.91	8.98
21	Athletics	3.51	569	162	1988	.642	104	58	162	3.44	983	22	4	64	1489.1	1,376	620	116	553	29	27	6,256	62	5.94	3.34	1.78	0.70	15.7	8.8	1.30	.275	3.75	8.32
22	Athletics	3.07	497	162	1989	.611	99	63	162	3.09	930	17	3	57	1448.1	1,287	576	103	510	28	23	6,026	71	5.78	3.17	1.82	0.64	15.4	8.5	1.24	.266	3.58	8.00
23	Athletics	3.17	514	162	1990	.636	103	59	162	3.18	831	18	7	64	1456.0	1,287	570	123	494	27	19	6,020	50	5.14	3.05	1.68	0.76	13.8	8.2	1.22	.256	3.52	7.96
24	Athletics	4.53	734	162	1991	.519	84	78	162	4.57	892	14	3	49	1444.1	1,425	776	155	655	55	30	6,299	60	5.56	4.08	1.36	0.97	14.2	10.4	1.44	.280	4.84	8.88
25	Athletics	3.7	599	162	1992	.593	96	66	162	3.73	843	8	3	58	1447.0	1,396	672	129	601	41	46	6,204	67	5.24	3.74	1.40	0.80	13.6	9.7	1.38	.276	4.18	8.68
	Total	3.97	35,714	9,002		.513	4,614	4,387	9,002	3.99	54,708	1,027	249	2,157	80525.1	78,029	39,505	8,515	29,998	2,523	2,096	344,074	2,956	6.11	3.35	1.82	0.95	15.9	8.7	1.34	.280	4.42	8.72