50mpg achievement!

[Magician]

We had a 2006 Saturn Ion and it was really efficient for highway driving. I drove from Omaha, NE to Portland, OR going 77mph average with 5 people in the car, luggage in the trunk and still got about 40 mpg. That's amazing! I know I could have gotten over 50mpg driving 55mph or less. BTW, it was a salvage title car that I had purchased pretty cheap as you should. We had for about 4.5 years and sold it.

[19bonestock88]

The cars are pretty good on the highway... if I lived anywhere flat id get much better freeway mileage, but I get about 35-36mpg indicated, going 75-80mph... as soon as the road flattens out, my instant mileage swings up into the mid forties...

[19bonestock88]

Figured I’d bring this thread back to brag about *almost* hitting the big 5-0... had a tank at 311.4mi and used 6.301 gal... over 49mpg! No filling errors to my knowledge either!

Tires at 55psi and my bigger trunklid extension and almost no short trips on the tank... coulda gone further but didn’t wanna pay a higher price on the fuel...

[mpg_numbers_guy]

Way to go!!!!

[MetroMPG]

Looks like the best tank yet for that car - congrats!

[19bonestock88]

THAnks again guys! It felt good to get so close to 50! I need more mods, but also maybe some maintenance... for most of the longer trips in that tank, the UG was reporting averages in excess of 60mpg, which makes me think I have an upstream O2 on its way out... I also really badly need to change the lower control arms, due to bushings being bad the camber and likely also the toe fluctuates with suspension load...

[mpg_numbers_guy]

Are you thinking that the UG doesn't detect MPG drops from the O2 sensor? Ik Torque didn't, but I figured the SG and UG would.

[19bonestock88]

That’s my theory, and it doesn’t always detect when I EOC, going up to 120-150mpg instead of 999.9... when I first got the car it would throw an O2 related code, and shortly after fixing the misfire it would throw a catalyst efficiency code, but now it throws neither...

I think I’d like to replace at least my upstream O2, or if I hold out until I replace/upgrade the exhaust(starting with header and going all the way to rear bumper), replace both and delete the cat...

[mpg_numbers_guy]

If there really was an issue though wouldn't you be getting a CEL? Regardless of the MPG readout?

Torque has a bug where above 100 MPG the trip average goes up slowly, but at 99 MPG it goes up fast - almost as if at above 100 MPG it changes the variables to make it count for less or something. Makes me almost want a scangauge or something, but not if it does that like you're saying.

[19bonestock88]

The UG recognized EOC and DFCO on every other car I had used it with, hence my thinking that the problem is with my car, not the UG... I have no idea why I’m not getting a CEL, other than I had realized back when I first started EOCing that it would keep the catalyst efficiency code at bay while I was using PnG, but within the first ten miles on the freeway with engine constantly running it would come back on... maybe my car isn’t picking up the problem due to my driving style...

It IS a mid 2000s GM car... I expected it to be a little buggy...