The no replacement for displacement is probably still true......BUT, if you compare todays motors to yesterdays. yesterday getting .5 HP per ci was normal, 1hp per cube was great! Today it seems that 1HP per cube is the norm, and getting 1.5 to 2HP is great! Torque is also up to a degree from yesterday too.
So while the quote is good, if you compare a motors of the same vintage, to compare a today motor with yesterdays is not always a good way to look at things!
BUT, as noted, two motors of equal HP, SHOULD pull a load up a given hill at the same speed. This does assume you have a drivetrain that explotes that motors HP strengths! Putting a 6000 rpm 300hp gas rig in a drive train ment for a diesel doing 300hp at 3000 rpm or vice versa, would do neither any good as a comparison. But put the proper setup in ea, both should be about the same speeds up a hill etc.
Also as noted, one WILL use more gas than diesel, but if one compares the BTU's of the fuel used, they should equal the same! Being as gas has 1/3 less btu per gallon, you will use more gas to accomplish the same task, same comparing alcohol, you will use more alcohol that gas which uses more than diesel to get the same job down!
Marty
