MPG: 22 city, 33 highway, 26 combined
Surprised the city EPA matches the 400 lb heavier NX
Somehow, it must be the 8-speed tranny and/or the engine tuning since this engine does have 6 more hp in the IS over the NX...
So, to recap, negligible difference in fuel economy and hindered by turbo lag on acceleration, as reported by actual owners or reputable sources.
The prosecution rests, your honor. We shall be seeking the maximum sentence for pre-meditated homicide of the reliable 2.5 liter normally aspirated V6 engine by Lexus Japan and Lexus USA.
LOL.
I too much prefer the IS 250's "anemic" 2.5L V6 any day over the NX's 2L Turbo thanks to it's far better launch and responsiveness, smoother idle and power delivery, and sultry engine/exhaust note (hear the vid below
). On the flipside, the heavier NX is BETTER than the IS in real-world overall fuel economy by about 5% so this 4 cyl is fuel efficient.
This is from true ownership experience of the NX AWD, now 1 year and 2+ years with my 3IS 250 AWD and 2+ years with my past 2IS 250 AWD. If I could swap out the 4-banger for the 2.5 V6, I would in an instant even at the expense of a 1s drop to 60 mph.