-   Hypermiling / EcoDriver's Ed (
-   -   Run 60 get 28, run 65 get 30, run 70 get 29. (

Varn 02-18-2013 06:07 PM

Run 60 get 28, run 65 get 30, run 70 get 29.
Mercedes 3.0 TD
Seems like the turbo diesel boost helps more than the aero hurts. My sample size is small but am going to continue driving 65 in my Mercedes for more data. I think I am comparing similar driving conditions. The engine is supposed to have peak torque at 2000 and 65 mph is 2800.

The car supposedly has a cd of .4 and is fairly small. yet pretty heavy for it's size. The engine is strictly old school IDI TD, no computer.


arcosine 02-18-2013 08:10 PM

MPG should be inversely proportional to MPH.

pete c 02-18-2013 08:12 PM

Don't buy it. Maybe if it had taller gearing. Keep us posted as you get more data.

niky 02-18-2013 08:33 PM

Should probably include data points for 50 and 55.

JRMichler 02-18-2013 10:04 PM

Tell us how you did your testing.

Varn 02-18-2013 10:24 PM

Tony I won't argue as to the theory. But I drove it for 3000 miles at 55.

My VW gets better mileage at 55 (55 mpg). It gets only 2-3 psi at 60. The Merc gets 5 psi at 60 and 8-9 at 65. Trying to find a way to get more boost at less speed.

niky 02-18-2013 10:29 PM

Drop a gear? :p

Varn 02-18-2013 10:33 PM

Nicky It is a 4 speed auto and 27 years old. Everything above 30 is in top gear. You might be right.

niky 02-19-2013 07:12 AM

If everything above thirty is in top gear, then thirty five is probably where you can get best economy.

Of course, that's problematic on US highways where going thirty is just as good as standing still...

oil pan 4 02-19-2013 02:47 PM

When I put a turbo on my diesel I picked up at least 2 to 3 mpg on the highway. And thats compairing driving 55-60 when N/A to +65MPH w/turbo.

Diesel engines are nice because the more air you can cram into the cylinders the better the fuel econony and power out put will be.
If you had a boost gauge you may see why there is a fuel economy jump at the higher speeds. At 60 the turbo maybe under such light load it may not be kicking out any boost, at 65 you could be developing 1 or 3 PSI and that small change can make a lot of difference.


Originally Posted by Varn (Post 357056)
Trying to find a way to get more boost at less speed.

Water injection

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