I usually run closer to 3800 RPM which gets me around 27mph. But I am burning a lot of fuel. I am going to back it down to around 3200-3400 which usuall gets me around 22mph. From what I have read the sweet spot for fuel mileage is somewhere in that neighborhood before the secondaries open up on the 454. If you are running 3000 you could probably bump it just a little and not hurt fuel mileage a lot.