Quote:
Originally Posted by t vago
In order to get a more efficient extraction of useful work out of an internal combustion engine, you would want a larger temperature differential between the intake and exhaust temperatures.
So, to answer your question from this perspective, you are not really gauging the amount of fuel you're burning. Rather, by increasing your EGTs by shifting into higher gears, you are making your engine more efficient at higher gearing than at lower gearing. At lower gearing under load along with lowering EGTs, your engine can't get as much work extracted because of the lower temperature differential, and therefore has to burn more fuel to get the same amount of performance at the higher gear.
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OK - thanks - I think that answers my question
So -- while in a given gear the EGT can be useful as an indicator of how much fuel is being burned, it is not of much use in deciding which gear to use.