2011 Highlander MPG issue

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Need some advice here.

Just bought a 2011 certified used Highlander, AWD, V6 in November of 2014. From the very first week of driving i was experiencing mpg in the 11-14 range. I was told that Maryland just switched to winter gasoline, and that's likely the issue. About a week after that, i start to notice a sulfur (rotten eggs) smell when i drive it first thing in the morning. I work remote-so the most driving i do is to the kids school (about 4 miles away) and back home. The smell normally hits us at one of the lights we stop at on the way to school. I try to remember to turn the 'circulate air' button on to close the vents from outside just to avoid the smell.

I brought the car into Toyota because of these two issues on 12/11/14. No check engine light, so I know this is hard for a mechanic to diagnose. They did all their testing, even took me on a test drive, and found nothing wrong. We averaged 17 mpg on the test drive trip, but that was driving on roads where we typically were going 40 mph with little stopping--which is NOT my typical drive to and from the kids school. I do 30 mph if i am lucky, and go through at least 4 lights and over 4 speed bumps.. all city driving. I do not sit idle in the carpool, so that is not a contributing factor. Anywho, i was told to put 93 octane in it and let it ride till on E and calculate as well. Tried that. It was just as bad. Dash showed about 13.8 and my calculation was below that.

Today i brought it back. Both my bro and father are mechanics and told me to have them put it on a 5 gas analyzer to see the hydrocarbon level at the tail pipe-since the computer is not picking up that there's an issue. They told me they dont have one of those, and all they could do is the checking they did last time... said the tires are the right size, the car's computer has no updates... Again, they found no issues. I brought the car in with 11.8 mpg on the dash (so they can clearly see that's well below the national reported avg of 15.7). I left, drove all the way home doing about 40mph and now have 10.5 mpg on the dash.

The smell is only there when driving the car first thing. No, i am not heavy on the gas. I have even tried letting the car drift as much as possible with my foot OFF the gas and still get the smell and bad mileage. If i do a trip odometer reading on the highway, i can get between 19-21mpg. City driving trips-full talks that is- have all been between 11-14 since i got the car. Am i the only one?? Is this normal for all city driving? Please let me know if anyone else is experiencing the rotten eggs smell.

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