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Old 02-17-2003, 10:03 AM
Registered User
Join Date: May 2002
Location: Irving, Texas
Posts: 80
Gas Mileage?

I've got a 98 e430 and took it for a road trip over the weekend. I averaged 27.4 MPG on the highway & got almost 540 miles from a tank of gas.... I was impressed, as this is better than my last car a 95 e320...... a V8 that get better gas mileage than a 6...... oh, the car has 56K on it, and I was thinking that around 60 K I would do the spark plugs and the O2 sensor... I'm thinking it may not be time yet.....
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Old 02-17-2003, 03:06 PM
Senior Member
Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
Replacing the plugs is a good idea. Your car has four oxygen sensors though, but don't worry about it. The car will tell you (via the Check Engine light) when you need to replace one!
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Old 02-17-2003, 03:09 PM
Registered User
Join Date: May 2002
Location: Irving, Texas
Posts: 80
it's got 16 spark plugs..... I didn't know that when I bought it....... 4 O2 Sensors? ouch, thats going to hurt.... I'd still rather do perventive maintenance. I hate getting stranded. In other words, I'd rather do maintenance on my schedule than the car's....
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Old 02-17-2003, 05:00 PM
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Join Date: Oct 2001
Location: Canada
Posts: 298
Modern V8s usually have 4 O2 sensors, but only 2 upstream O2 sensors got involved in fuel injection and can affect gas mileage. 2 downsteam O2 sensors are only used to monitor Catalytic efficiency, they only bring up a check engin code/light when CAT efficiency is low.

27.4 mpg is quite impressive, the best gas mileage I got from my 92 400E was 9.5L/100km (24.7mpg) when highway cruising in summer, in winter, the best I can get is 12L/100km (19.5 mpg).
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
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Old 02-17-2003, 08:00 PM
Registered User
Join Date: Dec 2000
Location: Mountain Island Lake, Charlotte NC
Posts: 376
That is impressive. I got 26.1 on the inaugural drive back with my of my latest purchase back from Lexington, KY. Its was an ebay purchase. 97 E420 70,000. I get around 20mpg in the city.
Rob Armstrong, Charlotte, NC
Mountain Island Lake

2004 VW Passat GLS TDI-50k
2006 Honda Odyssey EX-L 7k
FOR SALE 1991 300TE 228k

2003 Subaru Outback 57k Silver/Black-SOLD
2005 C230K 18k Pewter/Grey-SOLD
1997 E420 108k Black/Grey-SOLD
1986 560sl 200k Black/Palimino-SOLD
1985 300sd 340k-SOLD
1979 240d 170k-SOLD
2000 Volvo V70XC-POS couldn't sell fast enough
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