I took the C on a weekend drive around Lake Erie, about 750 miles, with events in Cleveland, Buffalo, and in Canada to attend. On one leg in a particularly flat part of Ohio, I pulled on the highway, and glanced down after a few minutes to find my all-time best fuel economy. You can see the specs for speed and distance, but I've never seen it the fuel economy this high before.



We soon got into some hills, and by the time we reached Buffalo after higher speeds, it dropped to about 31 mpg overall.

 

Thats awesome bro. Coming from my malibu it was a little bit of a shock to lose 10+ mpg. But apples for apples, this vehicle is way better to drive.

 

That's very nice! I always make it a game to get the highest MPG while taking long trips on the highway. I think my highest was 32 MPG.

 

I wonder what I would have achieved if I didn't have my wife and all her luggage aboard!!

 

yep, ive gotten 33-34.5 before in a c350 going 60 mph in cruise control... even 40 coasting downhill lol

 

I've gotten 32 mpg in my c350 going 72 mph during a 480 mile trip. I have a hard time getting 21 in the C63. lolz

 

I think I may have got you beat...!



This was my entire trip, averaged 34.2 mpg. Pretty darn good if you ask me, especially considering I have a 4matic. Who needs a civic?!?!

 

How is it that the best I can get is 29.2

 

Yes, you do! Congratulations! With that motor of yours, which also has great performance, you probably have excellent and efficient combustion and well matched pistons to the bore. You haven't blue printed it, have you!?!?! Your 4MATIC parasitic losses probably about washes out with my extra passenger and cargo, and you were averaging a lower speed, but you still win by two-tenths! Good work!

 

Haha, thanks. I'm not so sure what you mean by "blue-printed". I would imagine its probably a joke, as if to blueprint a house. But is there a way I can see how "good" my engine is? lol.

 

Here is a better definition from Wikipedia of engine blueprinting than I could write:

Blueprinting
In engine blueprinting, all the specifications are double-checked. Usually this indicates closer-than-factory tolerances, with custom specifications appropriate for a street car or a race car. The goals are either to re-manufacture the engine to the rated power for its manufacturer's design (because not all mass-production engines put out the rated power), or rebuild the engine to make more power from a given design than otherwise intended (because custom engines can often be redesigned to different specifications). Blueprinted components allow for a more exact balancing of reciprocating parts and rotating assemblies so that less power is lost through excessive engine vibrations and other mechanical inefficiencies.
Ideally, blueprinting is performed on components removed from the production line before normal balancing and finishing. If finished components are blueprinted, there is the risk that the further removal of material will weaken the component. However, lightening components is generally an advantage in itself provided balance and adequate strength are both maintained, and more precise machining will in general strengthen a part by removing stress points, so in many cases performance tuners are able to work with finished components.
For example, an engine manufacturer may list a piston ring end-gap specification of 0.003 to 0.005 inches for general use in a consumer automobile application. For an endurance racing engine which runs hot, a "blueprinted" specification of 0.0045" to 0.0050" may be desired. For a drag-racing engine which runs only in short bursts, a tighter 0.0035 to 0.0040 inch tolerance may be used instead. Thus "blueprint" can mean tighter or looser clearances, depending on the goal.