what am I paying for gas?

If there are any math or algebra 
geniuses out there, maybe you can tell 
me what I'm paying for gas.  I live in 
Mexico, and the only gas station they 
have there is the Pemex station.  The 
price varies by region, but where I am 
the price is currently 68 pesos per 
liter.  I pay in dollars, and they 
accept the rate of 10 pesos to the 
dollar, when in fact I think the real 
exchange rate is 11 pesos to the dollar, 
so I take a little hit there.  They 
won't let you touch the pump, an 
attendant does it for you, so I give her 
a 35 cents for that.  You can leave the 
tip out, as it's always the same 
regardless of how much gas she pumps. 
What am I paying in dollars per gallon?