[Roadsters] OT: EFI, Temp / Atmospheric Pressure Controls

[nmleeds at mindspring.com]

All,

I was just pondering (rather than putting the head back on my Datsun) and wondering, how do EFI systems compensate for fuel tempurature and atmospheric pressure.  Both should change the volume of the fuel relative to air mass and change the mixture.  Is there an adjustment, or does it not matter that much?

Nathaniel