If I pull up to a pump that had been pumping regular gas for the previous customer and I want to purchase only one gallon of high test for a special needs engine, will I get one gallon of high test if I push the button indicating a desire to purchase high test gas? Or, will I only get the remainder …

You’ll get some regular, so if it’s that important pump some high test into your car, then the gas can.

This is an issue I have with one of my motorcycles. You need to go to the station with separate hoses for each grade…

Those are getting harder and harder to find around my area.

You could wait for someone to fill up with premium, then buy from the same pump. Or, pump a few seconds of gas in your (or someone else’s) car, then fill up your one gallon container.

Not to ask the obvious, but…why is it a big deal? If you put 10 gallons of gas into a car, maybe a quart or two will be of whatever the previous type was. From that, the difference is at absolute worst is less than half an octane unit for the whole tank. Also, pretty much every modern car listens…

This is an issue I have with one of my motorcycles. You need to go to the station with separate hoses for each grade... Those are hard to find. And every time one of those gas stations gets upgraded they go to the 1 hose design. 5 years from now you may not find one.

Ugh, sorry to be so silly: just reread your original post. texases comment sounds great.

You might try to goggle search how much gas is in the hose from the previous gas purchase. Some of this depends on the length of the hose. In most typical gas pumps I’ve heard it is about 1/2 gallon. If you want only one gallon of premium and the pump dispensed regular to the prior customer, you …

You could add octane booster to your gallon to be safe, but doing what texases says is easier.

@Made - any chance you’ll let us know why you need 1 gallon of 100% premium gas? Just curious.

High Test Gas and Regular Gas

General Discussion

JosephEMeehan November 22, 2012, 7:20pm 18

Higher than needed octane is not really helpful.

Topic		Replies	Views
Octane switch at pump Power/Fuel gasoline , pump	29	33454	March 18, 2020
Pumping gas Power/Fuel gasoline	35	4141	October 29, 2015
Putting high octane gas in occasionally. Wondering if the high octane gets stale General Discussion	35	6333	September 29, 2015
Premium versus Regular The Show subaru	214	10486	October 8, 2010
Regular gas vs Premium Power/Fuel gasoline	7	7307	October 8, 2010

High Test Gas and Regular Gas

Related topics