Speed varied from 60 mph to 80 mph. I would describe my driving style as smooth and steady. When traffic conditions allowed (it was quite busy being a Bank Holiday) I put the cruise control at 70 mph. Constant speed driving on a motorway is the best for economy. On the way down to Bristol I got 31 mpg but travelling in city traffic (heavy in Bristol) really knocks down the economy and it was reading 29 mpg as I left Bristol. Town driving, even with a very light throttle, knocks the mpg right down. This was all based on the computer but I will do a fill-up and calculate again. I am not particularly concerned about mpg - as I am running a 4 litre V8! - but it is interesting to compare with my old 2.0 petrol people carrier.
People's perceptions of the LS 400 V8, not familiar with the Lexus, are also interesting. "What do you get to the gallon? 15 mpg?"
After frowning at them they say "Oh, around 20 mpg then?
If I can get between 28 and 30 mpg on a long run, then I consider it worth every penny for the driving experience an LS 400 gives. When you need to accelerate from say 60 mph - the power is superb.
On the negative side of driving the LS 400 ............. well I can't find one yet.