Originally Posted by Hodge Podge
The 2012 owners manual states:
"We do not recommend taking fuel economy measurements during the first 1,000 miles (1,600 km) of driving (engine break-in period). You will get a more accurate measurement after 2,000 miles–3,000 miles (3,000 km–5,000 km).
Guessing the 2013 would be similar but too lazy to verify...anyways, My experience was:
0-1000: low-mid 20's
1-2000: improved to just under 30
2-3000: improved to low 30's
3-4000+: low/mid 30's in mixed driving, finally seeing 39~42 on the highway
When I hit the 1,000 mile mark, the change occurred between fill-ups...
998, 999, 1000 >>Ding - Level Up! - 5mpg fuel economy upgrade unlocked
Subsequent improvements were also noticeable, but much more gradual.
I did a LOT of highway driving, which may or may not have something to do with the slightly longer break-in.
Also, it seems theres a slight power increase as the engine breaks in.
Give it some time and the occasional full throttle run, it'll break-in nicely.
As a side note, a few folks have noted the 18" wheels cost a few mpg as compared to the 15-17" wheels...YMMV
Mine didn't seem to follow the same pattern.
For the first four tanks from delivery to just under 1300 miles the average was =34.2 in mixed driving (mostly commuting 10 mi or so per direction per day.
From 1300-2500 or so miles the average actually went down to 33.88.
From about 2500 to about 3300 the average was 35.74
From 3300 to 5027 or so miles the average was 35.68.
I've had a few tanks in the lower 40s, and one at 42.1 over 470.1 miles with three people in the car, but even the first tank averaged 33 mpg even after deducting the 18 miles from delivery from that figure.