Scan Gauge Fuel Error Correction
 

OK guys I filled up my Strawberry today at the same gas station, facing the same direction, and using the same pump that I used in my last fill up. According to the scan gauge I had 1.5 gallons left in the tank with an average of 17.5 mpg. The analog gauge showed the tank at 1/4 tank. So I filled the van up and to my surprise it filled up at 15.036 gallons. I entered the info in the scan gauge and it was -19.4% off. When I first put the SG2 in the van I set the engine size to 3.3L, gasoline, and 20 gallon tank. Is this normal?

Normal I suppose. I'm at a 4.6% correction. Last fill-up, the car's low gas light came on at just about empty (1.5 gallons left). SG2 reported 0.9 gallon remaining, 11.1 gallons used out of 12. A 0.6 gallon variance. I got 10.6 gallons into the tank. In my case the car's idiot light was off by just 0.1 gallon. I had driven on a mile and a half since the light came on to get to the gas station.

My guess is the accuracy is not as close in a vehicle with a larger tank. More air at the top of the larger, almost twice my capacity (wider?) tank causing the large variance?

Yes I had an error correction of just less than 4% iirc on my first fillup .They've been closer to spot on since .

Well the good thing is that my actual calculated gas mileage for that tank was almost 22mpg. I just hope it was a SG2 error and not an error at the pump.

Does 19% seem too high? You're ranges were less than 5%. I guess we'll have to wait and see.

1/4 a 20 gallon tank would be 5 gallons. You put in 15 gallons. I'd say the car's gauge was spot-on. Maybe SG will be more accurate through the current tank with the correction factor. You may find that the correction factor drops little by little at the next few fill-ups.

I've had a correction as high as 13%. YFUMV.... Your Full-Ups May Vary?

Did you by chance remember to 'save' your tank/engine input ? On Linear Logics' FAQ that was one of the points made, as it will revert to default settings otherwise - wouldn't hurt to double check (It does happen often )

MnFocus I sure did. I checked at the gas station just to be sure. I have it set at 3.3 engine, 20 gallon tank, gasoline.

Well I'd say give it a fill up or two - if it doesn't get closer then contact Linear Logic . Wouldn't worry about it until then . Just do the error corrections as needed and let it learn .

Will do. Thanks

Putting in the correct values also gave me way low scanguage numbers. The defaults (15gal and 3.0L engine) give me a value that's just about right on. :confused:

Eh, so I go with that and don't bother doing the fillup adjustment. Cheers to your tank coming out better than expected.

I was happy to get almost 22. 90% of the driving was done to work and back which is about 4 miles one way. My last fill up I averaged 15mpg. Hopefully my grill block will get me a little bit more.

As you should be ! :thumbup:

Now about "a little bit more" - this is a case where greed is good ! Just watch the temps ,please?!

I finaly figured to just correct till it showed a daily reading close to what i have gotten on tank before and when refill i'll see how close it is. if close enough for me i'll just keep correction the same. according to the mileage and odometer reading it's probly reading under a touch.