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Old 01-05-2010, 01:36 AM   #1 (permalink)
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Join Date: Dec 2009
Location: Lancaster Ca
Posts: 362

Tank - '76 Chevy El Camino Classic
90 day: 25.89 mpg (US)

Sabrina - '91 Mercedes Benz 190 E
90 day: 37.07 mpg (US)

Angel - '88 Mercedes-Benz 420SEL
Last 3: 23.01 mpg (US)

Quicksilver - '04 Mercedes-Benz CLK55 AMG Cabrio
Thanks: 52
Thanked 8 Times in 8 Posts
Good mileage Bad Whether

So me and my dad went down to santa clarita to drop my little sister and brother off tonight (it's a 45 mile trip from driveway here to there) in his 1988 Mercedes 420SEL , which he just got recently. We've done nothing to this car yet other than an oil change. the car was fully loaded on the way down with luggage and 4 people in the car. It was 42 Degrees out so i was thinking crap bad mileage. My dad drove about 65-75 the whole time. when we got there the car was smoking . The secondary cat is CLogged up and BAAD on there. So my dad was a little more concervative on the way back 60-70 MPH on the trip back
We used 4 gallons of gas and went 90 miles
I was like 22.5MPG

Not great i know but pretty good for a car that is bone stock with a bad cat

Sure our other mercedes' do better than this one on the freeway but i still feel this isn't bad for the car it is

I'll update the numbers after we fix the car

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(No actual EPA numbers for car just used F/E numbers when i first got it)
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Old 01-05-2010, 11:46 AM   #2 (permalink)
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Join Date: May 2008
Location: N. Saskatchewan, CA
Posts: 1,721

Appliance White - '93 Geo Metro 4-Dr. Auto
Last 3: 42.35 mpg (US)

Stealth RV - '91 Chevy Sprint Base
Thanks: 89
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The comments about cold weather economy are not actually inspired by "California Cold," although the effect is always present.
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Old 01-05-2010, 12:14 PM   #3 (permalink)
Master EcoModder
 
Join Date: Dec 2009
Location: Lancaster Ca
Posts: 362

Tank - '76 Chevy El Camino Classic
90 day: 25.89 mpg (US)

Sabrina - '91 Mercedes Benz 190 E
90 day: 37.07 mpg (US)

Angel - '88 Mercedes-Benz 420SEL
Last 3: 23.01 mpg (US)

Quicksilver - '04 Mercedes-Benz CLK55 AMG Cabrio
Thanks: 52
Thanked 8 Times in 8 Posts
Quote:
Originally Posted by Bicycle Bob View Post
The comments about cold weather economy are not actually inspired by "California Cold," although the effect is always present.
thanks, Well it was 36 degrees on the way back too

I had just heard from guys on the forum that colder whether hurts fuel economy so i was trying to make the info as accurate as i could for reference
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(No actual EPA numbers for car just used F/E numbers when i first got it)
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Old 01-06-2010, 10:39 AM   #4 (permalink)
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Join Date: Aug 2008
Location: Lake Charles
Posts: 193

Black Beauty - '09 Honda Accord EX-L
90 day: 27.44 mpg (US)
Thanks: 12
Thanked 11 Times in 10 Posts
Interesting...

A clogged cat could be restricting your engine on the Mercedes. If it has computer capable of fuel trim, it might be leaning out your injector timings.

Does the car drive sluggish during hard acceleration?
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Old 01-06-2010, 01:01 PM   #5 (permalink)
Master EcoModder
 
Join Date: Dec 2009
Location: Lancaster Ca
Posts: 362

Tank - '76 Chevy El Camino Classic
90 day: 25.89 mpg (US)

Sabrina - '91 Mercedes Benz 190 E
90 day: 37.07 mpg (US)

Angel - '88 Mercedes-Benz 420SEL
Last 3: 23.01 mpg (US)

Quicksilver - '04 Mercedes-Benz CLK55 AMG Cabrio
Thanks: 52
Thanked 8 Times in 8 Posts
Quote:
Originally Posted by rgathright View Post
Interesting...

A clogged cat could be restricting your engine on the Mercedes. If it has computer capable of fuel trim, it might be leaning out your injector timings.

Does the car drive sluggish during hard acceleration?
Yeah very sluggish especially once is been driving for a while

We're going to replace the cat today or tommorow

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(No actual EPA numbers for car just used F/E numbers when i first got it)
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