Quote:
Originally Posted by Spuds
Winter mileage difference may be related to:
1. My ltft goes from -3 in the summer to +4 in the winter. While that by itself would not necessarily cause this effect, it shows that the there is some calibration in the ECU that may be off. I am running oft stage1, but I dont think they messed with the ambient temperature calibration.
2. Oil temperatures are about 30 degrees lower in the winter, making it slightly thicker.
3. Colder air is more dense, meaning you have to push greater mass out of the way at speed.
4. Tires don't have a chance to get as much heat in the winter as summer, so the air inside doesn't expand as much, causing running tire pressures to be lower.
5. Freezemiester hates us.
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6. Fuel mixtures in the winter are slightly different (not sure if better or worse for mileage but probably worse)
7. Denser air means you can burn more fuel which means more hp / less mileage if press the gas as hard as you normally do.
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