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In general, newer == better FE, all other things being equal. The B16 motors make about 110 lb-ft of torque, but it's at a higher RPM than the peak of 99 lb-ft for our motors. (Don't remember the RPMs, sorry!) When the B16 is babied (a rare occasion), most people report slightly better MPG than with the D16 motor.
The newer D17 should be capable of rather better.
Note that gearing has a sizeable effect on fuel economy With our Si trans, we are spinning 3000 RPM at 60 MPH. The cable-shifted trans from the early B18 Integra LS is geared taller, so it will drop your cruising RPM and improve FE. Ditto just about any other D-series transmission; our Si is geared about as low as a D-series trans gets.
-soD
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