Hi,

So I've been reading some of the topics and noticed, that you guys, are having mileages like: 20 mpg, etc.

I have Daimler V8 Super 1999 and computer states that it is using ~20 liters/100km (~11.8 mpg) with sport button off.

Is this normal? If no, what do you suggest?

 

I have a 2000 Vanden Plas Supercharged, basically the same model as your car.

11.8 MPG sounds a little low, but is believable with cold temperatures, short trips, and no highway driving.

First, I'd check your computer's calculation with your own math at a fill-up. My trip computer consistently shows that I've used one more gallon than I really have, which shows up as a lower displayed MPG than what I'm actually getting.

I only use sport mode and in mostly urban driving, I'll average around 15 MPG (US gallon). A long trip at highway speeds (70-80mph) will barely squeak over 20 MPG (US gallon).

TTYL
David

 

Thanks for your reply. I'm driving on a highway/city 50/50. Will try to fill up the tank and do some calculations then.

 

My 1999 XJR also gets 10% better actual mileage than the trip computer shows, I average 17mpg around town, 22 on road trips (steady 80mph), and 6-7 mpg at a steady 130+...
Sounds as though you might need to replace your air filter element and possibly spark plugs as a first effort at better fuel economy.
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IOLITE VAPORIZER REVIEWS

 

Spark plugs were replaced ~1 month ago, not sure about air filter, will check.

P.S. How many gallons/liters does fuel tank hold?

 

Capacity 23.1 US Gallons / 87.4 Liters
Gauge should indicate empty at 19.8 US Gallons / 75 Liters

Another thing to consider is the ethanol content in your fuel. My area requires all gas to be sold with a minimum of 10% ethanol, which negatively affects mileage. My economy numbers might look more like Markus's in an area with no ethanol.

TTYL
David

 

98 XJR around town is getting something like 11mpg. That supercharger makes a lovely whine as it winds up though...

Probably worth checking my air filter I guess. I have a little scooter for around town and with the same amount of petrol, I can travel over ten times the distance!

 

"Another thing to consider is the ethanol content in your fuel. My area requires all gas to be sold with a minimum of 10% ethanol, which negatively affects mileage."

I have noticed increased fuel consumption and decreased power when forced to use gasahol. The old saying "alcohol and cars don't mix" has great merit, IMHO - on many levels!
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VAPIR NO2 PRICE

 

Air filter was changed in autumn, so guess it's as good as it can get.