Periodic km, fuel and money usage

It seems that I lost a few invoices, but the monthly bottom line - around 1000 Km of usage, the fuel consumption 17.1 km/liter and the cost 350 Sh

	kilometers	liters	cost	km/liters
month/year
July 2010
19	265	15.186	98.56
23	253	14.8	96.17
29	281	16.299	106.11
total August 2010	799	46.285	300.84	17.262
3	286	16.570	106.88
8	272	15.318	99.11
18	292	16.038	103.77
23	260	16.47	106.57
total	1110	64.396	416.33	17.237
Sept 2010
5	275	15.69	101.83
14	250	15.265	97.54
20	238	13.761	88.21
total	763	44.716	287.58	17.06
Oct 2010
1	254	15.580	100.02
11	280	16.118	103.48
15	260	14.888	95.58
21	272	15.000	96.30
26	281	16.056	102.76
total	1347	77.642	401.84	17.348
Nov 2010
1	259	15.452	100.44
7	255	14.670	97.12
11	273	16.063	106.02
16	269	15.261	100.72
22	252	15.567	100.74
29	253	15.496	102.27
total	1561	92.509	607.31	16.874