This isn't really a major achievement. I used to get 400+ on road trips on my non-avcs equipped modded 2.5RS. All it really requires is keeping the car at or below 80mph consistently for 400 miles. a good example of this would be I-15 from Utah to Las Vegas. Or US50 from Reno to Delta. Or. Or. You get it. It's just got to be a long wide open stretch of highway and some restraint on the loud pedal.