I have an 87 t2 and I have horrible gas mileage. Partial reason I think is from start up. I have made a note of where the gas gauge was, and later on started the car and the gauge was down quite a bit. Mind you when I start the car, it warms up for a good 4 or 5 mins. I get about 250km a tank on 89 octane with full rb exhaust. That does include some spirited driving to and from work. If I go to 91 octane the mileage is just unbearable. Is everyone getting about the same thing? On a road trip, on the highway I get about 450km to a tank. I know there's alot of threads on this, but I think my start up is guzzling gas. What can I do about it?

 

You are not measuring the fuel consumption correctly. Also, there should be no fuel consumption difference between 89 and 91 octane from the same gas station.

Use this method:

1. Completely fill the tank with gasoline.
2. Zero the odometer trip gauge or write down the odometer reading.
3. Drive until the fuel tank gets down to about 1/4 full.
4. Completely fill the tank with gasoline and note the amount pumped into the tank.
5. Note the reading on the odometer.
6. The fuel consumption is then calculated by dividing the distance driven by the amount of gasoline used.

The US EPA estimated fuel consumption for a S4 TII is 7.23 km/L city, and 9.78 km/L highway.

 

Thank you, you beat me to it. Miles per tank is wildly inaccurate. I have run out of gas when I thought I had a gallon left, and had three gallons left when I thought I was almost out.
Also, octane rating should have no noticeable effect on gas mileage.

 

Yea I have done a poor *** way of finding my mileage. I would fill the tank, 0 the trip timer, drive until near close to E. I'll try your method, and return with results in a week or so. Although its hard to get an accurate calculation because of the spirited driving, its hard to not do it.

 

Just limit yourself. its not that hard to do. My T2 has a whole bag of tricks done to it and I fill up (well from 1/4 to full) about once every 9 o r10 days. I do have the luxury to live close to work and school though, exery weekend I commute 200km or so and I last for a little over a week. But from what you are decribing it sounds like you are running excessivly rich. Purcahse an afc and get it tuned by a professional. I saw results in both power at the rear wheels and at the gas station.

 

You're referring to the apexi power fc commander correct? How much would that realistically increase mileage?

 

Well, it doesnt increase mpg. My T2 was running way too rich before and I installed it, go it tuned and now instead of burning all that excess fuel I can use it on what it is designed for; driving. It leaves me with more gas to burn with my streetport'd T2. It will NOT increase mpgs. My bad, I worded it wrong.

 

I think he's referring to this.

People sell them here for like $100 or less...



This is the PowerFc.
Very Popular for FDs




Check this out too..
http://www.zeitronix.com/Products/zt2/zt2.htm

 

^ Yup. I have the AFC NEO. (Its the newest one)

 

So how can it use less gas but not increase the gas mileage? LOL

The PFC is an engine control unit intended for the 93-later RX-7. The AFC is a piggyback fuel computer popular with the 86-92 RX-7.

 

Depending on your idle speed at warm up (I sit at 1500 for 2-3 minutes and it drops down to 800 after another 1-2 minutes w/Apexi PFC), of course it burns more fuel than at operating temp. It shouldn't be too significant/noticeable though. Proper tune, maintenance, and sparingly applying the throttle will help improve mileage. Unless you are ported/tuned, use 89 octane. The faster burn is great for the rotary.

Edit to add: To be honest, you're going to get poor KPL/MPG with city driving; especially with a T2. As for octane rating, it's a value that estimates volatility of combustion (poor explanation, but I'll post links that detail true octane ratings/usage if you would like).

 

Take a look at these for PFC for FCs.
PFC 1

PFC 2

PowerFC for FC , Discontinued

S5 Install