wilber1 wrote:mich800 wrote:wilber1 wrote:ShinerBock wrote:Cummins12V98 wrote:
I will bet towing them side by side they will get similar mileage. No way 1-2 mpg different. Running solo maybe.
The larger efficiency engines get better fuel mileage than the performance versions even when towing. An engine with a higher compression ratio will be more efficient than the same engine with a lower compression ratio at all engines speeds and loads due to its higher thermal efficiency.
This higher efficiency is represented as a percentage so a 20% increase for example of a higher number will be be greater numerically than a 20% increase of a lower number. For example, a 20% increase of 15 mpg is 18 mpg while a 20% increase of 10 mpg is 12 mpg.
Nissan's variable compression ratio engine uses high compression/low boost for economy and switches to low compression/ high boost for power.
Googled it. Looks like it changes the stroke. Looks complicated. What is the durability track record in a high performance application?
Looks complicated but it depends on how well it is engineered and assembled. Today's engines in general are far more complex than those of 30 years ago, make much more power for their size and are much more reliable to boot.
