Tar Sands and EROI

1. Tar sands should be extracted first has a higher energy return on investment compared to oil shale.
2. Extracting oil shale and tar sands both require being heated up to extreme temperatures to break up the minerals that the oil is attached to.
3. The key difference between the two extractions is that you have a higher quantity of oil when extracting from tar sands.
4. Off-shore oil drilling results in a much higher EROI. In this case more oil is retrieved with less fossil fuels to get it. 
5. When ordering pizza I try to find the closest pizza place who sells pizza for the least amount but is still really good pizza. Therefore less money is spent, less energy is wasted going to get it and there is still a good output.