Good mileage Bad Whether

[Domman56]

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

[Bicycle Bob]

The comments about cold weather economy are not actually inspired by "California Cold," although the effect is always present.

[Domman56]

Originally Posted by Bicycle Bob

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

[rgathright]

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?

[Domman56]

Originally Posted by rgathright

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