Here is the 4 cylinder, 4WD
The Tacoma is available with a 4-cylinder engine and 4x4. Use the Toyota configurator and you will see it can be. Then click "Find inventory" and those trucks near you will show up. I did it today and vehicles were available from dealer stock. Perhaps in your zip code it is not a configuration stocked by dealers. Here is the 4 cylinder, 4WD fuel economy from fueleconomy.gov. I took a close look at the numbers in the story and made some clarifications, but the premise is correct. Thanks for the comment: http://www.fueleconomy.gov/feg/PowerSearch.do?action=noform&path=1&year1=2015&year2=2015&make=Toyota&model=Tacoma%204WD&srchtyp=ymm
I'm sorry you will have to cut and paste the link.