X308 XJR fuel economy

[rassi]

This is clearly not my main concern, but before getting more serious with getting one, I would appreciate any indications of what kind of fuel economy that can be expected for fast-ish (100 mph cruising) motorway driving (in Europe), and what range it would have under these circumstances?

Thanks!

Anders

[groomi]

Bearing in mind that my car has covered over 100k so may not be quite as efficient as it maybe once was, I get around 20 - 21mpg when cruising at 90-100mph. This kind of average will get about 300 - 350 miles out of a tank, which in the uk costs £65 to fill with optimax.

For the record with continuos driving in town. expect to see a mere 12mpg.

Over the 7000 miles I've covered since buying my car I have averaged 18mpg in total.

I hope that helps!

Regards,

Iain

[rassi]

Thanks Iain!

I thought I had read the fuel tank was 81 litres, so was hoping for slightly longer range. 20 mpg would be around 8 km/l?

Have a MB C43 (which after an accident and run-away driver last week may be a write-off...) which has a pitiful 63 litres tank and average about 7,5 km/l at brisk motorway driving, which works out at a range of 400 - 450 km.

[groomi]

Yep - 81 litres. Doesn't get you far these days, but you do enjoy getting there!

[DrDeAtH]

just a quick question.... what flavour petrol do we all put into our 'R's ??????

[800]

Optimax- nowt else

[NormanD]

Standard Sainsburys,
have tried Optimax etc. but didn't notice any improvements.

[P700DEE]

Supermarket standard unleaded

[MJK]

I mainly use normal unleaded 95 Ron. Occasionaly treating it to a tank of super unleaded 97 Ron, say every 10 tank fulls. Don't notice any difference.

[XJR420]

I find I get slightly better mileage out of decent (ie not Supermarket) fuel. I havent tried Optimax yet, does it make much difference? if so to power or mileage (or both?).

For the record my R has done around 50k miles and returns around 19mpg on average (wearing quite heavy boots!). She did 27mpg recently on a quick run from Kent to Edinburgh and back (around 880 miles).