js0823

My previous 2013 Audi Q5 prestige had all season tires, just like my current Q5.

They are both exactly the same, except the year.

I don't drive harsh at all. In fact, I'm more of a safe driver who doesn't like pushing the car around alot.

The climate here isn't great and roads aren't great either, but I do see quite a difference in my previous Q5 and current Q5, or I'm being too sensitive about it I'm not sure.

I'll drive a bit more and see if anything changes.

AudiQ5sleeper

have you done your first oil change?

Kobi's Q

I think one poster might have it right with the weather being a cause. I have noticed that I can't get the same MPG on my commute since prior to Thanksgiving that I was getting all spring-summer-into fall. Even during the Holidays when there was hardly any traffic I still couldn't get the same average I was getting in the summer. I just figured it was because of the weather even though it hasn't been to bad most days. I would say I have lost about 2-6 mpgs depending on the day than what I used to average. Also some states also change their "fuel formula" for winter which also could have an impact on MPG.

rarewolf

Admittedly, I'm in Canada, and it's been a relatively bad winter so far, but I'm seeing (estimating) an 10-15% decrease in mileage since breaking in our Q5 last spring.

awryexperiment

I notice a huge DROP in efficiency between November and March here in NJ. During this period the NJ state environ"mental midgets" require a different formulation that most engines do not like.

Q5 Bob

We get winter blend gas in IL too and gas mileage dips during the winter period.

js0823

Winter period causes mpg to fall? That's new for me. I will do little research on that.

One thing I did read online is that poor oil may lead to bad mileage.

I'm even beginning to wonder if they put normal oil instead of quality synthetic oil into my Q5. I didn't put the first engine oil, Audi dealer shop did, and from what I know I shouldn't change oil until the first service, no matter what. Is this true? Should I just go ahead and change oil to see if it's any better?

I hope this isn't true, but what if Audi dealer put in normal engine oil? Would that damage my engine and cause mpg to go down?

Q5 Bob

Are saying that the oil in the vehicle hasn't been changed since it was delivered new? If that's the case, then it would have been filled at the factory and not at the dealership. If it was filled at the factory there is little doubt that it isn't the correct synthetic.

Xylar5

My F150 owner's manual even says states so. I have noticed that anything below 50F and the MPGs start falling off. I have theorized it has to do with the Cold air and the whole reason why people put Cold air intakes on their vehicles.