Quote:
Originally Posted by GretchenGotGrowl
I'm not sure where you are getting this information about fuel economy. So far the LT1 has only been EPA certified in the C7 vette and the LF3 in the CTS Vsport and XTS Vsport. So we don't have a common platform to make comparisons of fuel economy.
I think you are basically saying the same thing as me. They could have given the SS just the L99 with either a M6 or A6. For what ever reason, they offered both so I don't see why not with the 6th Gen as well.
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Someone from GM's engineering said over the summer that the LF3 is tuned for power over efficiency. On the LT1, they made a fairly small improvement in power yet have yielded impressive fuel economy gains. Some of those gains might be from the rest of the C7, but I would be willing to bet a lot of it comes from the engine itself -given how slick the C6 was vs all the vents & such on the new car. Thats where I am coming from on the tuning of the two engines.
As for fuel economy, I looked mainly to the CTS. The new CTS, when equiped with the same LFX V6 as the Camaro (and is of similar size, weight, and drive config) gets essentially the same FE as a V6 Camaro (if not a touch better). When comparing the V-Sport to the SS, its the exact same story. So I feel pretty confident in saying that the LF3 gets nearly identical fuel economy to the LS3/L99. And if its the same as the old generation of engines ... and the gen V's are more efficient than the IV's, then it is reasonable to conclude that the LF3 is
not as efficient the new V8s. Is it a true, pure, direct comparison? No. But if A is less than or equal to B, and B is less than C then you can conclude that C must also be greater than A.
The L99 wasn't offered with manual SS's because they hadn't sorted out how to make the 4 cylinder mode play well with a clutch. I guess they have since solved that issue with the C7/Gen V. Plus, it wasn't needed to get the SS manual beyond the gas guzzler tax.