Dunno if you'd count it as hard rock or not, but...
Alice Cooper - Welcome to My Nightmare

I've also found these great to cruise to...
Barren Cross - Atomic Arena
Barren Cross - State of Control
Bloodgood - Bloodgood
Bloodgood - Rock in a Hard Place
Deliverance - River Disturbance
Eternal Decision - Eternal Decision
Holy Soldier - Holy Soldier
Holy Soldier - Last Train
Mastedon - It's a Jungle Out There
Megadeth - Countdown to Extinction
Megadeth - Youthanasia
Megadeth - United Abominations
Place of Skulls - With Vision
Rez - Awaiting Your Reply
Rez - Rainbows End
Rez - Silence Screams
Rob Rock - Rage of Creation
Rob Rock - Holy Hell
Rob Rock - Garden of Chaos
Sacred Warrior - Rebellion
Stairway - The Other Side of Midnight
Trouble - Psalm 9
Yngwie Malmsteen - Marching Out
I excluded stuff that tends to give me a bit more of a speed boost (ala Early Tourniquet, Deliverance's Weapons, Megedeth's Peace Sells, etc), lol.
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