If you were referring to the Vortex being a waste of money, I agree. :-)
If you were referring to doing the mods to the car then see below.
I am going to disagree that it is a waste of money to do some of the listed things.
On my Se I bought a used Fiero electric fan from the wrecking yard for $20.00.
I tested my mileage with the stock fan set up and then with the electric fan.
Same distance, same speeds, etc........ (This was all highway testing)
Increase was 1 MPG
I did a test with the stock coil set up versus the 2nd gen one.
Did this twice driving the same distance (Highway).
Mileage was an average of 2.5 MPG better with the 2nd gen VS the stock coil set up.
Again got the Coil set up from the wrecking yard for $20.00
So for $40.00 I got an average of 3.5 MPG
The testing was done with a RB header/Pre-silencer system so I don't know what the gains would be running a stock exhaust system.
Overall with all the mods including the things that I mentioned plus the usage of a S4 N/A transmission out of an 88 model with the best overdrive. Using Acetone in the fuel I have managed to get a best of 31 MPG on the highway and average about 25-26 MPG combination driving.
Thats a 7 MPG increase on the highway and an average of 8-9 MPG increase with combined driving.
It also helps that I am at a higher altitude and the elevation ranges from 3600 -
Peejay's report in the thread link that I provided with his low gears, ignition timing tweaks etc, has been getting extremely good mileage.
My last run this week consisting of speeds from 45MPH (8-9 miles), Average speed of 70 MPH (150 miles) with 2 short runs of non mentionable speeds (remote area).
52 miles of in town driving and speeds from 25-45 MPH the MPG was 25.3.
My test before that of 300 miles. consisting of combination of City and Highway driving, speeds from 35-65 MPH the mileage was 27.6 MPG.
Originally Posted by whitey85mtu
waste of money. Cheapest way to increase fuel economy is to drive slower on the highway. lower revs = less fuel, but more time. Or a nice late 80's base CRX that returns close to 50mpg will cut your fuel costs. not pretty, but high mileage.