Overkill

I finally got a job and now have the finances to purchase a new engine. Im considering both the engines above, but with gas like it is, i need something that wont suck gas like a hoover. Anyone here with an SR or RB please give me some advice. All im looking for is at least 20-25 while driving easy. I dont care about mileage when i'm driving it hard, in my opinion you cant put a price on that. Anyways all help is greatly appreciated...

NightXCZ77

Either engine will do that just fine...you'll probably get better mileage with a RB20 since it uses smaller injectors (even though there are more of them)...