Don't mean to hijack your thread but this is similar. We just picked up our 06 GS crescendo 8356 and drove it home 6 hours. looks like I got ~7 MPG Previous owner said he got 10 consistently going 70 on the highway (was he exaggerating?). I wasn't towing but I did run the generator since it was stupid hot in florida. My wife was following and she said every so often and randomly there would be a puff of smoke out the exhaust. Any ideas. Should I throw some fuel cleaner in it, not sure how long it's been sitting but it only has about 20K miles on it. Dealership just changed the oils. Power seemed fine, but I don't know what to expect. It got up to speed just fine and I set the cruise at 70 on the interstate.
The engine is a Cat C7 but we were told it was a 300, 330 and a 350 by different folks. How can I tell?
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