Excellent input guys. I'm not going to go into great detail on this subject and will keep it simple with a couple of facts. When we refer to “pump gas”, what are we talking about?
E10 is the most commonly dispensed fuel at the station. This fuel absorbs water from the air and has a shelf life of about 90 days. It's garbage after that.
When was the fuel purchased, winter or summer? They're different blends designed to do different things. The bottom line is they're not designed to do anything your ATV engine needs. Pump gas is designed to run in road vehicles that run at 185 degrees F with an average RPM of 2000 – 3000. If that's how you ride, have at the pumps. An octane number is nothing more than a reference to the fuels ability to resist detonation during combustion. The higher the number, the more resistance. Race fuel isn't going to make you go faster unless you need it. An engine that detonates on pump fuel needs a mix or strait race fuel.
A stock Blaster will run fine on pump fuel as long as it's fresh and you're not beating the dog out of the engine.
Our “pump fuel” builds will run fine on fresh premium fuel but I'm leaving a little bit on the table.
Everyone thinks “race fuel” is expensive. It's dirt cheap in my book. Five gallons of VP110 will run you about $75. Mix that with five gallons of 93 octane for a total cost of $86 for 10 gallons of fuel. That's $8.60 per gallon for fuel that's going to work in the mud, sand, hills, and when the engine is under the most stress. How much fuel do you use per ride? I'm guessing less than two gallons. That's a grand total of $17.20 to have the time of your life and not worry about destroying a very expensive component of you quad. Now think about what a quality top end rebuild is going to cost. It's a no brainer and the piece of mind is priceless.
At best, pump fuel is inconsistent and you never know what you're getting. I run it in my 2016 Kodiak but it's always fresh, stabilized, and I ride like an old man. I found 145# of static compression on Sunoco 94 octane was the limit when I could still beat the shit out of a Blaster. Static compression of 160# would always detonate without a 50/50 mix. I always ran straight 110 in my static 180# builds. Keep in mind, these were Blaster engines. My general rule of thumb is ANY modern two stroke motocross bike requires a mix of 50/50 race and pump fuel or you're asking for trouble. This turned out a bit longer than I expected.