can any owners of C280 99 preferably what they get for mileage? I've noticed I get 12mpg to 15mpg around the city and highway about 21mpg, combined city and highway 18mpg to 20mpg. This seems awful low. The car has 51K plus miles, oil is changed every 6K miles. Still has the original plugs (I guess) Change the air filter faithfully twice a year. Am I low, average or OK? I never really kep accurate records. except the first 6 month I had the car and my notes tell me I was getting around 25mpg highway and a combined of 19mpg to 20mpg. I do have a semi heavy foot.

Also, the installation of the dead pedal was a snap, once I lined it up in position and got the first screw in, the rest took about 10 minutes and it looks and feels good on my foot.

Thanks

 

The mpg seems low to me for a six-banger. I would be disappointed if it were mine.

Pull the plugs, clean them, and check the gap. I'd replace platinum with copper. Better performance. When you put the plugs back in, put anti-seize on the threads.

Get some fuel injector cleaner.

I thought you used a K&N cone filter on a custom tube? Why do you replace the filter twice a year? Double check the filter location to ensure it gets fresh air and isn't sucking warm air from under the hood.

Check your tire pressure.

Are the tires you're using now a different size than the tires you had when you got 25 mpg?

Remove the dead body and landscaping stones from the trunk. Go on a diet. Extra weight, you know?

 

Mine goes 400 miles per full tank (16.5-gallons?) So, it's like 24 miles per gallon. This is all my typical city/hiway mix driving.

I can get 340 miles per tank for city driving. On a highway trip, I get 450 miles per tank at 72mph cruising speed.

All data with AC ON.

Btw, is changing spark plugs on this car, as simple as a corolla? Or would I need special tools and procedures?

 

I can't say for sure. These MBs are so weird sometimes. I doubt the plug itself requires anything special, other than possibly a long extension. There's probably more work than on a Corolla. Things like engine covers and shields and stuff that need to be removed first.

I can tell you that I broke 3 or 4 plug wires when I changed mine. They cost $65 each to replace. They have a round thing to pull on for removal, but mine were stuck on so bad they broke before I could get them off. I don't know if yours is at all the same. Our cars are quite different.

 

I'm right there with fly_major_fly. Typical is 24mpg mixed driving. I've gotten 26mpg in mixed, but that was by never pushing the rpm above 2K, and using cruise even on back roads: rather impractical way to drive.
I have an OEM air filter and will switch to hi-flow K&N or AFE (a brand I like a bit more) soon.
My '99 C280 Sport will turn 80K next month.

My prediction: The only reason oil will settle around $60/ barrel this fall and winter will be market manipulation. ($67/barrel today!!!!) I've heard the actual cost to extract a barrel of oil from the ground is $5 or below? But then there is that damn “supply and demand� thing.
Much more oil will be discovered, but well-intentioned environmentalists and their allies in congress will halt the building of refineries so prices stay high. This will allow alternatives (hybrids, fuel cells) to be desirable, even with a higher price tag, when they hit the market full force.

 

I am changing the spark plugs and putting the hi-flow air-filter! Which national chain auto-parts store carries that hi-flow filter?

One last question, any special tool needed to remove plugs?

 

too high consumption. it's time to read the fuel injection actual value.

faulty airmass sensor and oxygen sensor can also cause the enrichment.

we can always program to lean it by a few milliseconds.

 

Do a search for: K&N Air Filters. You should find lots of sources; even some brick and morter chains

 

Dead body & extra weight, go on a diet.
Next you'll be telling him to remove the passenger seat & the drivers heat restraints and only travel with half a tank of gas!
You guys crack me up sometimes!

 

I was going to tell him to get rid of the wife, but he beat me to it. He's getting a divorce.