By Drew Johnson
Friday, Jul 25th, 2008 @ 10:46 am

Just when you thought that the Chevrolet Camaro stories had finally come to an end, our spy photographers have gotten the scoop on another Camaro model under development. Although still in mule form, the latest shots indicate that a more fuel-efficient Camaro could be on the way.
You’ll recognize this hacked up Holden Commodore from last year as a 2010 Camaro mule. Several months ago, we photographed this one running around outside the Milford Proving Grounds with an odd bump in the hood. Normally when we see hood bumps, it usually means a forced induction or hybrid powertrain is hiding under the hood. And since the supercharged Z28 model is officially off the table, the picture is a little clearer.

At the time we couldn’t say for sure what was under the hood. Now, thanks to GM product czar Bob Lutz, we think we have a pretty good idea what this mule is.

During an interview at London’s Motor Show, Lutz confirmed they had been testing the 2.0L turbo four cylinder from the Solstice GXP and Saturn Sky Redline for use in the Camaro. We think this mule has that very powertrain.

We observed this mule doing several stop and go tests, running up to about 5mph and then stopping. We think this may have been to test for possible turbo lag.

It’s still up in the air whether GM will go ahead and produce the turbo’ed 4 cylinder Camaro. A new 216hp, 2.0L Ecotec motor debuting in the Opel Insignia may also be a possibility for the Camaro.

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