NEED REAL WORLD DATA: 2WD vs 4WD mpg...

I can't seem to work the Search tool very well and I'm up against it, finding myself on a fast track that seems to get faster by the day. I'm looking at purchasing a Tundra this week, circa post-2010 models, and can't make up my mind between 2wd and 4wd. The specs say there's only a mile difference on mpg between the two when it comes to a 5.7L V8 engine. I plan on driving about 12,000 miles per year all through the western states but not bouncing a lot - I'll be trying to find jobs on the road and stay awhile when successful, so I'm thinking about 70% city/town driving the rest on the highway.



What I want to know is just how much less mileage does 4wd get in the real world?



Thanks in advance,



Jeff