Su Lianyuan says, it is with Xiali car exemple, waiting for every 100 kilometers below fast condition to use oil only 4 litres, the other car that discharge an amount wants oil 6 litres. According to this computation, at present Tianjin has the small taxi that discharge an amount many 30 thousand, run on average everyday with every taxi 100 kilometers plan, tianjin a day only taxi but the section is oily many litres at least 60 thousand.