Are These Figures About Right?

[bluenose1940]

I took my IS250 for its first decent run since I bought it at the end of September 2012.

I went up to Lincolnshire via the M5 - M42 - bits of the M1 and M69 and then the A46 and A17, a total of 545 miles round trip

On the motorway I was using cruise control at around 75 mph with the odd surge up to 80 mph. This included the usual interruptions of 50mph on three contraflow systems.

On arrival back at home the computer was showing an average of 38.2 mpg.

I'm not too sure how accurate the on-board computer is but am wondering if this is the sort of return I should be expecting.

The drive was superb and effortless with plenty of power being available when needed. My three passengers all enjoyed the comfortable ride.

I made sure that I purchased my fuel before going on to the motorway. I topped the tank up for the return journey at 132.9 per litre and when we stopped off at the Michael Wood services for a cuppa I noticed that they were charging 143.9 per litre!!

[normski2]

Yep you are in the right area.

If you back it off to around 66 mph on the m-way you could see 40 mpg...... depends on the rush you are in.

[Carl911]

I have found I get between 38-42 on the motorway sticking around 75mph, so you sound pretty much spot on what can be avhieved