So I just moved from CA to AZ and sold my 2010 250 mostly due to the hassle and expense of moving it. Was planning on replacing it here, likely with a 300. Some folks are trying to talk me into a Yamaha Y3. Any ideas? They said at 7000 ft I would need more power but doesn't electronic fuel injection account for thinner air?
EFI WILL account for thinner air, but it will do so by pulling fuel. It will run fine, but will be down on power.
Before you listen to anything other people say, try it out for yourself! On a trip to Montana, I got to ride a grom at about 4800 feet, and it was pretty slow, but I could still hit about 57-59 mph without a drafting buddy, up to 66 mph in a superman tuck while drafting the WRX in front of me. It was plenty at 45 mph or less, but above that it felt pretty dead. I also didn't have the pleasure of needing to climb any hills, so it worked out fine for me.
Earlier in that trip I took my V6 accord up chief joseph highway which is about 8000 feet and the power loss was very clear. On my OBD2 reader I have a engine load gauge which uses pressure in the intake manifold to determine percent load. Down in Georgia I can get it up to 96% at full throttle. Up on chief joseph it would only go as high as 83%. That road was an absolute blast though, sharp 180 degree corners, steep climbs, PASSING ZONES!!! I spent a whole lot of time above 5000 RPM there.
I can only imagine how much fun it would be on a motorcycle, one with enough power that is, not a grom.