Talked to mechanic, and he made a lot of sense. Told him I put one in and he said "WHY!?". Natually I said to keep it running cooler, and to prolong the melting of the plasic intake thing.

He made a good point: The car will run leaner thinking the car is cool, much like how the choke works on an old carb. Thus cuasing pooer econmy. ANd I think he'* right. becuase I've noticed a dramtic difference in milage on my current tank of gas(post 180 tstat), than my previous(195 tstat) tank.

Didn't replace 02 yet, im thinking about just taking it back to the strore and getting my $90


I don't know if this coincidence, but This tank of gas, which just about empty, got maybe 17 MPG, while the other tank got and easy 24. The otehr tank was more highway, but both tanks had almost equal shares of highway and city. I'll try it for one more tank and see what happens, then without any more mods, try the 195 on a tank of the same gas, and see what happens. I'm kind of excited to see the results.

Hmmm...GTP, Heavily Modded (see sig), has 160 degree thermostat, gets 35mpg. Need I say more? The t-stat doesn't hurt your fuel economy.

Switching to a 180 degree thermostat doesn't even make that big of a difference in heat unless you get your fan turn on points altered anyways. Any gas mileage loss you noticed was from different driving conditions, or POSSIBLY the computer learning the colder temps, although I highly doubt it.

he prolly wants you to leave it so you have to take your car in there if the intake goes...lol i figured out that people on here know more than mechanics...id ask here for somethin w/ my car before a mechanic...

Well ****...I beleive you guys when you say the tstat doesnt have much of an effect of fuel econmoy, but after 3 tanks in the post 180 tstat world, I've avergaed about 20-22 MPG as opposed to upper 20'*, low 30'* without it? But then again, I only ran the car one tank before rlacing tstat. I think i might switch it back, just to see if there'* a dramtic difference.

Sometimes counting mpgs is trade off for protecting your upper intake manifold. What kinda fuel you running? Up the octane to Silver 81 or 91.

352 miles is not all that bad. 566 kilometre...*****...why complain for good vehicle protection, but what do we know anyway

Well, at this point it would seem natural to blame your 180tstat on the poor gas-mileage.. but before you come to a conclusion i would check other parts that could cause poor gas-mileage first and make sure they are working properly. ..and if so, then maybe it is really affecting you...but with previous experiences in this forum with it not affecting gas-mileage, i find it hard to believe that a 180 t-stat will cause that..