Ive recently bought a 2004 Jag S Type but the fuel usage seems to be very high. On a motorway drive from Southampton to London used around 20 Litres of Shell V Power & BP Ultimate / around 35.00 GBP of petrol on the way there and 35 again on the way back. What would you recommend to increase mpg and would this be considered typical? 

10 hours ago, stype said:

Ive recently bought a 2004 Jag S Type but the fuel usage seems to be very high. On a motorway drive from Southampton to London used around 20 Litres of Shell V Power & BP Ultimate / around 35.00 GBP of petrol on the way there and 35 again on the way back. What would you recommend to increase mpg and would this be considered typical? 

Am assuming you are talking a petrol engine ??????????? . Also assuming litre cost of around £1.48, which would be about 24 gallons . Assuming Southampton to London is around 80 miles. That is therefore an MPG of 3.3 .  WOW that is a lot of petrol. My 2005 (Facelift) 2.5 V6 does an average 23 -24 around and about locally and on a run like you describe I would expect it to return 26 - 27 MPG. 

Assuming you do not have a VERY heavy right foot then you have serious fuel problems which need attention very quickly before some major damage is done.

Best Wishes and Regards, John

I think I would be looking for leaky fuel tank for a start.

 

12 hours ago, stype said:

Ive recently bought a 2004 Jag S Type but the fuel usage seems to be very high. On a motorway drive from Southampton to London used around 20 Litres of Shell V Power & BP Ultimate / around 35.00 GBP of petrol on the way there and 35 again on the way back. What would you recommend to increase mpg and would this be considered typical? 

Welcome to the club, Ambrosian,

Firstly I think that a 2004 s type would have a 2.5 litre petrol engine which would probably return 32 mpg on a motorway towards London from Southampton which is not too bad.

Secondly, you will have to mark down the traffic level on that road.

My s type is a diesel with a 2.7 litre engine which on one occasion on a motorway with a speed limit of 50 mph due to road works gave me 50.2 mpg and 46 mpg on a different route on return. A round trip on the M1 and the M1 & M42 return - a 190 round trip. A petrol engine with a similar car would at best been around 35 mpg.

Regards,

Peter.

hi

you definately have some issue there, the 2.5 has most probably the worst fuel consumption, but thats quite bad

I can easily get 35 mpg out of my S-type R on a motorway with cruise on

worth checking for fuel leaks, but would of thought you would smell any sort of fuel leak

cheers

Joe