I always heard 1 gal of gasoline to 40 gals of fuel Bruce, I have no idea if works or not but the truckers believe it does in the winter time in WY Fwiw
Power Service will freeze I had a bottle freeze one time in the back of my pickup so I never bought anymore of the stuff
Yeah, a bottle of Power Service is supposed to be 'good for 250 gallons' but the temperature it goes down to depends on how much you use. Looks about a wash. 1 gallon for 40 is a 2 1/2% concentration of gas - not sure how much that relates to for Power Service concentration.
Also, gasoline (being a "spirit" in refining terms rather than an oil) will prevent diesel (which, of course, is an oil) from gelling, even if it doesn't have EHN in it but I'm not sure how much it takes without the additive.
Yeah, Power Service will freeze or gel up. It's like salt - salt is "frozen" at 150 degrees but if you put it in water, the freezing point of water will drop from 32 degrees to down near zero (depending on concentration of salt in the water). But when Power Service (and I assume other diesel additives - I'm pretty sure "Fuel Power" is the same chemical, not sure about Lucas) is added to diesel, it will reduce gelling down to 30-40 degrees.
There is some reference group (may be something "Petroleum Retailers Council" but also may be API) that publishes "%-age below normal temps" for localities in the US and Canada for October through April. Diesel fuel is supposed to be "winterized" from the pump to be safe at pretty much any expected temperature. But it's specific, so don't fuel up in San Diego and drive to Yellowstone in January without filling up with local-winterized fuel when you get where it gets cold.
Bryce, 40's is supposed to be OK for fuel, even "unwinterized". Could you be having a problem like a sensor telling the engine ECM that the engine is hotter or colder than it is and the fuel injection is being mis-set? Obviously, something is going on but it might not be the fuel gelling.
OK, enough petroleum nerdness for now, Bruce H NC USA