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[Jer]

Did you buy one of the raffle tickets for the Ruger Precision ?

Details?

[fitz19d]

Use whatever octane rating that your engine doesn't ping on while under a load. If you're pulling trailers all the time, then use the good stuff. If you're putting around town with no load, use mid grade. That's what I do.

Havn't noticed pinging even after stopping much less tooling around. Calls for 85, but was wondering about using 87 if that has any health benefits long term or possibly better mpg or something.

[Irving]

Check the user manual to see what grade the motor was designed to run on. Motors designed to run on the lowest grade may even lose performance by running a higher grade. Then it would just be a waste of money.

I think that the newer the vehicle, the better the computer is at adjusting to maximize performed on any given fuel though.

[Jer]

Check the user manual to see what grade the motor was designed to run on. Motors designed to run on the lowest grade may even lose performance by running a higher grade. Then it would just be a waste of money.

I think that the newer the vehicle, the better the computer is at adjusting to maximize performed on any given fuel though.

Correct until that last statement. If the manual says 85 you won't get any performance increase from higher octane. You would need to either up boost or advance timing to take advantage of the additional octane and there's just too much leeway for the lowest common denominator for ECU's to take advantage of higher octane. Just run whatever the lowest octane your manual calls for. In some cases, I will monitor knock activity and even run lower than that in some instances but will go back up in colder temps or when traveling to lower elevations or towing or something.

A lot of people think higher octane is 'better' for their vehicle and this simply ins't the case. If you have the tools handy to take advantage of that higher octane it can be but in a stock configuration the only benefit you will see in terms of performance is in the lightening of your wallet.

[Irving]

It's been a while, but the way I remember it is that the higher the octane, the slower the flame front starts in the cylinder. This means that if your vehicle is designed to run on 87 (nothing is designed to run on 85 because most of the country doesn't have 85 due to elevation), and you are running 93, the fuel combustion is happening slower, so instead of igniting right at TDC, the ignition may be occurring after your piston is already traveling back down. Then you're just wasting expensive fuel while getting less power to boot. Do I have that right?

[Big E3]

The octane requirement for most cars is calculated for sea level. The octane calculation for 5200 above sea level is about 2 points lower. This is do to atmospheric pressure at this altitude in the combustion chamber being lower. Higher octane that necessary can actually slow the burn rate and reduce power. This would obviously not apply to a vehicle with a turbocharger or supercharger because they create there own atmosphere.

[Great-Kazoo]

The octane requirement for most cars is calculated for sea level. The octane calculation for 5200 above sea level is about 2 points lower. This is do to atmospheric pressure at this altitude in the combustion chamber being lower. Higher octane that necessary can actually slow the burn rate and reduce power. This would obviously not apply to a vehicle with a turbocharger or supercharger because they create there own atmosphere.

^^ This is why running 85 here is equal to 87 @ sea level or lower elevations , as in NE, or KS.

[MarkCO]

You using the BG for older vehicles primarily, or frequently even on new vehicles? This thing is stupid flex fuel. Up till now my vehicles all been premium and I feel dirty using low grade normal pump gas, was thinking of running mid grade since it sure helps with my weedeater. But if it's made to handle E-85, would going too good in the other direction perhaps be counter productive?

They run best on Sake doncha know?

Your best mileage usually comes at about 15K, but you could run 4 tanks of 85 and 4 tanks of 87 and see which one is better for mileage. Unless you have an engine that requires premium (and even then) the computer will adjust the tune. You might lose a few hp in the peak of the power band, but then no-one really drives there much anyway. One good thing about E-85, is you can (should) run 1 tank in the spring to clean up the fuel system and it will keep the power up and make it last a little longer.

[waffles]

Picture dump

[Big E3]

Waffle, Is that last one a 6906? I fondled one yesterday at the Tanner, but just didn't think it was enough different that my 669 to grab it. I need another handgun like I need pockets in my underwear. Those are a sweet size to shoot and/or carry.

That 52-2 would be fun, is it 38 special? Always thought it would be cool to shoot but having a gun that size that only holds 5 rounds seemed a little impractical, but who cares it's cool.

I have no idea what you have in the middle? K frame, 3" barrel swap, top rail, custom?