Here is another page with locomotive fuel consumption figures:
http://www.alkrug.vcn.com/rrfacts/fueluse.htm" onclick="window.open(this.href);return false;
It shows the 9 series using slightly more fuel than the 7 series, which makes sense because of the slight increase in horsepower. But what's also interesting is that it shows the 9 series using
less fuel in the first two throttle notches. The increase starts slightly at N3 and then increases with each additional notch. In terms of horsepower per gallon, however, they are virtually identical.