I'm probably leaving myself wide open here, but isn't filling your tires with nitro just a gimmick?
I think Tire Rack says it best.
"So what should drivers do?
Overall, inflating tires with nitrogen won't hurt them and may provide some minimal benefits.
Is it worth it? If you go someplace that provides free nitrogen with new tires, why not? Additionally we?ve seen some service providers offering reasonable prices of about $5 per tire (including periodic adjustments for the life of the tire) to a less reasonable $10 per tire (with additional costs for subsequent pressure adjustments) or more as part of a service contract, which we believe exceeds the value of nitrogen?s benefit.
Rather than pay extra for nitrogen, most drivers would be better off buying an accurate tire pressure gauge and checking and adjusting their tire pressures regularly."
If they do it free of charge why not but I wouldn't pay for it. I just check them with a digital gauge and adjust accordingly every 2 weeks.
2006 530i, Titanium Silver, Dakota Black
1st reg. 2005 (born 27/4/2004) 530D Tourer, auto, Titanuim Silver, Black Dakota Leather, DMS to 260bhp & 413 lb/ft, Bluetooth Phone, Advanced aircon, auto dim mirrors, folding ext mirrors. 6CD Changer, Progman 25, Winter set up Conti-wintercontact 810 225/50/17 on 138 rims, Summer Pirelli P Zero Rosso's 245/45/17 on 122 rims. Osram Silverstar halogen upgrades. E60.net Clings.
Yes, Costco does it for free. I got 4 brand new tires for my van last November. Drove to Colorado in the winter (froze my ass off, drove up to nocal during the summer and now it's a year later. Througout the past year the tire pressure looked exactly how it did since I got them.