About 3 mpg optimistic on the MID is about right.
I'd check tire pressures, especially with colder temps. coming. I see roughly a 40% mpg improvement with the tires at 39 psi all around vs the 36 psi I put them at, when I bought the car.
I believe 33 psi is recommended. Just adding some air to the 33-36 range could easily get ya up to the 42 mpg area. The EPA overall estimate is 41 for the old I2's 42 for the new ones.
Principles supporting my driving style for even higher EX mpg:
Have the engine operate as little as possible, especially when standing still or moving slowly; while also meeting my demands for power and maneuvering. This means most battery charging while cruising city streets and rural roads, max regen from slowing down and downgrades, and only using heater or A/C when the engine is on for other purposes.
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