If you don't want to read a ton, the tittle says it.
Sorry for spelling and grammar issues
This test was done on a 2001 jeep wrangler TJ, 4.0L Automatic, 31" Cooper discoverer ATRs, American racing 767 offset 15" steel wheel. Flowmaster super 44 muffler. ProComp Genuine steel bumpers front and back with smittybilt d-rings. Rugged Ridge extended fender flares. everything else stock. (hard top, full doors)
I watch my MPGs quite closely as a diagnostic tool to make sure nothing is wrong, and since I knew what I was getting I wanted to improve it if possible. (Im on a wrangler forum and see MPGs anywhere from 12-18 on 4.0 TJs) On the site I kept reading about seafoam and what it is and what It does. After reading sooo many positive things about it, i figured I would try it. I normally dont go for things like this and felt like a total fool paying 8 bucks for a bottle of it at walmart. I was mainly running it to keep things clean as a maintenance preventative thing since the jeep is 10 years old with only 66k miles on it. My guess is it wasn't driven often or never had long commutes, both situations can lead to build up. so I added a 16oz bottle of it to a full 15 miles deep full tank. (17 gallon tank, had about 16 in it, so I ran about 1oz to the gallon as the bottle suggests)
My previous tank before the seafoam was a normal routine driven tank, 190 miles and filled up with 14 gallons. which got me around 13.5 MPGs.
I had read that while driving with the seafoam, its best to drive aggressively or run it while going on a long trip, or while towing. so for me, i beat on the jeep and drove it like a punk. I then noticed My gauge was moving slower (my usual 100 mile half tank was 120 mile half tank) but I figured the gauge was being weird since it is a 10 year old Chrysler and I didn't think anything much and would just wait till my next fill up to calculate. well my next fill up was 211 miles on 15 gallons of fuel, giving me 13.8 MPGs (numbers varied a bit with decimals i forgot, but final MPGs are the true calculation, so my math here may look off) I was a little disappointed but knew that beating on the jeep may have held a major roll.
so the next (and recently calculated in todays fill up) tank I drove like normal, all 3 tanks consisted of the same locations (for the most part) and I just drove as anyone else would. speed limits, no excessive acceleration..ect.
I ended up going 215.1 miles with 13.4 gallons. giving me 16.03 MPGs (tank still read a hair under 1/4 tank but I didn't trust the gauge since this was my farthest distance yet on a tank) so I was pleasantly surprised.
My odometer and speedometer are spot on and double checked with GPS.
I fill up at the same station each time and fill till the pump stops, then try to fuel even more to have the pump cut off immediately, signalling its full.
Only variable I can think of is the temperature. The first 2 tanks were in 10-28 degree weather and the last tank had a few 40-50 degree days.
I drive mainly on rural roads and dirt roads with a bit of main road driving threw town that can sometimes be stop and go city driving. I probably put 35 miles of expressway driving on each tank also (70-75 MPH)
so as of now, im gonna say if you have a older low miles vehicle or something that sits at times or never gets to max temp due to short drives or something that just isnt getting the MPGs it should be then you might wanna do your own research on seafoam and maybe even try it out. I ran it in my gas this time, but I may try vacume lines as many suggest. many even run it in their engine oil to clean sludge and things. im not sure If im going to go that far. Theres tons of info on seafoam all over google.
pretty neat stuff IMO
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Originally Posted by Mr_RPM
