The problem you can run into is inadvertantly mixing the VP fuel in with your Sunoco fuel as NHRA uses VP as the "official" fuel and Sunoco wont be sold at an NHRA event. Even straight Sunoco seems to be a problem with NHRA tech at times.
I would rather use Sunoco as it's roughly 30% cheaper than VP. Personally, in my application, I can't tell any difference between the two brands; other than in the wallet.
NHRA #7494 SS/H
1970 AMC AMX
"Best Appearing" @ NHRA '06 Pacific Sports Nationals
JeffLeeAzRealty@Qwest.net
602-418-9797