VSOT - HUGE mileage increase?

Messages
22,188
Location
Colorado Springs
I added a 1/2 bottle of Synpower oil treatment to my Dad's 98 4.3L Blazer and brought the cold tire pressure from 30 back to the speced 32 psi. He drove from CO Spgs to Denver and back and got over 30 mpg [Eek!] Truck has 180,000 miles worth of pretty hard driving. [I dont know] Sometimes I get concerned that something is broke on the truck BECAUSE it has always gotten unheard of gas mileage!
 
Messages
7,039
Location
MIchigan
I got the same engine in my Blazer and according to my scangauge I'm getting around 23MPG. How can you tell you got 30MPG.
 
Messages
22,299
Location
Apple Valley, California
Some engines do get better milage than others just like them. I had a 1978 Toyota pickup that would get 42mpg. When I was driving semi trucks most trucks would get 5.5-5.8 mpg. One truck in particular would get 6.3-6.5 no matter who drove it. All trucks had the same drivetrain.
 

Drew99GT

Thread starter
Messages
22,188
Location
Colorado Springs
quote:
I got the same engine in my Blazer and according to my scangauge I'm getting around 23MPG. How can you tell you got 30MPG.
Via the trip computer. Normally it gets around 22-23 mpg all highway. All I did was add the 1/2 bottle of SPOT, 1 oz of LC, and topped of the tires. I've never seen a mileage increase that high from adding ait to the tires, and they weren't really that low!
 
Messages
297
Location
NJ
I have seen VSOT give mileage increases on older cars via sticky rings being loosened. I have seen very little (read near zero) mileage difference going from 30 PSI to 32 PSI.
 
Messages
345
Location
Northern California
Was this over a single fill up? If so what were the ones before and after this one. Some times the air bubble in the tank throw things off. But I do believe some single examples of a make and model do get much better mpg. I had a 82 Honda Civic like that; wish I still had it. Someone ought to figure why and make all of them like that. Must have something to do with balance of the power being made.
 
Messages
297
Location
NJ
"Someone ought to figure why and make all of them like that." Its all in the tolerances of the engine. The deck hieght of the cylinder block would be one of the biggest variables to this. 30 years ago if the deck hieght was +or- 0.020" you were doing good. I have seen some engines +0.040" on one side of the block, and -0.005" on the other side. Today they are getting that spec down to 0.005" give or take.
 
Messages
498
Location
N. Texas
Trip computers are notoriously wrong. I did have one on a C5 once and it was fun to watch it go to 99 on instantaneous mode when exiting on a downhill off ramp from the highway though.
 
Messages
1,292
Location
Western Washington
When you're filling your tank, if your gas has a lot of air bubbles in it when the pump shuts off, and you don't top off, then you'll have a little less gas in the tank than you think you do. When you fill up next time, it will look like you used more gas than you actually did, and your mileage will look worse. Its not by much, but its there.
 
Messages
1,407
Location
Vail, Colorado
Don't most trip computers calculate fuel used directly from the ECM? Fuel added to the tank to return it to 'full' only matters for manual calculations...and even they will average out over time.
 
Messages
553
Location
USA
Hi I drive the same route everyday, with the weather as the only major varience. Even the times of mileage is roughly equal..i.e. same time of day..etc. I use the same gas station, and almost always the same pump. Tires have been inflated to 36psi since "week 1" and checked several times a week first thing in morning before car moves. week 1....1066 miles....27.28mpg..... fresh M1 10w-30, Full bottle VSOT week 2.....618 miles....28.06mpg week 3.....720 miles....26.61mpg week 4.....678 miles....27.15mpg week 5.....752 miles....25.47mpg week 6.....858 miles....24.34mpg week 7.....735 miles....24.65mpg week 8.....722 miles....26.58mpg......fresh M7500 5w-30, 5oz VSOT week 9.....762 miles....26.99mpg Week 9 begins 2x dose of FP60. FC20 has been the standard treatment since M1 was first used. L36 3800 V6 L26 UIM w/ TB adapter
 
Messages
13,228
Location
1/2 hr N.E. of Detroit
I don't know about you guys, but the back of the VSOT container talks about the engine benefits... not the gas tank pros & cons. This stuff help keeps a new engine looking/driving/acting new. That's all I care about. I use it constantly & it has not affected my MPG plus/minus-1 since day-1.
 
Messages
553
Location
USA
Hi I can keep my 3800 looking and driving just fine with GC / M1 among other choices, but potential "reports" on fuel economy some months ago drew me to VSOT. I cant say if VSOT helps mpg much if at all at FC20 doses, but economy sure fell badly after 3000 miles on a fill of M1 10w-30 and full bottle of VSOT. However, it went back up immediately after a fresh fill of M7500 5w-30. I doubt the viscosity difference of 5w and 10w made any affect.
 
Messages
1,779
Location
Central Iowa
FuelEconomy.gov rates that vehicle at 16/20 for 4WD, 17/23 for 2WD. So you claim to be getting 8-10MPG over that with just tire pressure and an oil additive? Me thinks not...
 
Messages
297
Location
NJ
"but economy sure fell badly after 3000 miles on a fill of M1 10w-30 and full bottle of VSOT." I think I might have seen this too, mileage going down more towards the end of the run of VSOT. Its hard to say really.
 
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