Seems like a few threads have touched on the seasonal impacts on hybrid mileage. Since I have 3 years of mileage data, I put together a graph of my experience. I used a monthly average, which was typically 2 or 3 tanks of gas. I included what the average temp is around here. Couple notes: Dec thru May are typically very rainy. Summer is usually mild enough that the A/C is only used in August (maybe late July and early Sept, depending). I had the computer upgrade done in August 05, and new tires in Nov. Enjoy!

 

excellent work... confirms what we all know <grr> Time for a warm air intake

 

Nice! Looks like your mileage got alot better since July/August of this year compared to previous years. Do you attribute that to better driving techniques?

 

Sort of. Late 2004 was when I adopted better driving techniques. Several things happend all at once in July/August: I started running at 45 psi on the tires, I got the computer upgrade, and the weather was downright optimal. No rain, 80 degrees (no AC needed). Just dry, clear and warm.