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Originally Posted by Deadma1474
I always wanted to know the same thing. Like my pickup truck with a 5.7 Hemi gets 16-28 But if you were to put a smaller engine in it would it get worst mpg. They offer it in a 6 cylinder and its is suppost geting worst gas millage. But they say thats because the hemi has mds.
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I've noticed this to happen quite often I think a lot of it has to do witht he transmissions. To get the same power output, the smaller engine has to be at higher rpm than the large one, so they usually stick a higher final drive ratio on them.
As far as underpowered vehicles go, my newest aquisition has a whopping 90hp. I was a little concerned about fuel economy since it only has a 3sp automatic, and not much for aerodynamics. My first trip with it was 800 miles of interstate at 70-90 mph. The pedal was nearly to the floor the whole time, and to my amazement, it retured 26 mpg!! A vast improvement to the Merc. with twice the H.P. and roughly equivelant Cda.