假如有两个面试正好挨着，开车从我的居住地（叫他A)到第一个面试的地点（叫他B)，然后从B直接到第二个面试地点去(叫他C)，然后从C回到A(基本路过B)。两个地方都号称给报销mileage（不知道有没有水分，其实我以前面试垫的钱还都没收回来呢），那是不是不应该把A到B这段路费让两个地方都报销一遍，这样是不是有乱收费之嫌？可是如果不让他们俩都报销，怎么跟他们解释呢，难道说，我还有别的面试，你们两家分账吧，这种话不能说吧？

r u talking about different cities or just in one big city?

no big deal. But I doubt if you can take the compensation from both company. Don't you need to hand in the receipt for gas? Then, you have to make up a lie to one of them expalining why you don't want to bother to get the gas fee back. Otherwise, you surely can and should take the compensation from both companies to save yourself some trouble.

我前面报mileage的时候对方都是要求给一个mapquest的driving direction，上面写了mileage。toll才要receipt，我还常常忘了要receipt

A到B和B到C都是上百mile.

This tiny little money is probably nothing for the company. If you want to be 100% honest, that's nice. But if you just file reimbursement to both companies, I don't think it's a big issue at all.