I kept my 3.70 diff gear from when my car was AT. May swap to 4.10 in the future though

damn davew you sponsered by Shell or something.

jk i love shell and have noticed a little bit of a difference in fill up intervals

3.90 ;)

correction: 3.90 gear thanx

I park it and drive an economical car. The same goes for our towing pickup truck - it's parked unless we need it.

Don't I wish... :lol:

Dave

This.

My average MPG has been around 22-24 using shell v-power. I do alot of highway driving now but i believe the gas help as well. Or maybe my car is in top running condition, idk.

I pulled my secondary injectors out and jb welded the rail closed. Can't get bad gas mileage when you can use your gas

:nod:

Add all the bolt ons, leave the stock center cat and set the boost at 10 psi. The base map is fine for this and you'll get 12 to 14 mpg of spirited driving 18 to 20 mpg on the hwy.

I'd stick w/ the base map unless you know someone who's a super good tuner. Meaning tons of rotary tuning experience like PFS, Bonzai etc....

It's not intended if you don't know the proper proceedure. That's how I drove mine. You have to be sure to do the water steam cleaning twice a year to maintain the carbon build-up. My maintenace was change the plugs and fuel filter once a yr or every 12k. I did the water treatment every 6 months. In 108,000 original miles, my engine never flooded or had hard starting issues. One time I even tried to intentionally flood the engine while it sat up for 2 months in winter. I did a series of cold quick starts in 30+ degree weather and it fired up every single time. I also got 25+ mpg on the highway.

Mods:
modified stock air box with k&n filter
down pipe

BOP made my car run way smoother and my tank gives me a good extra 30-40 miles since I deleted those shit... but I guess some part were not working properly...

Sounds like me. I drive the FD for fun, and a Ford Focus for most stuff. I tow my racecar (see avatar) with a '74 Chevy Van that gets 7-8 mpg towing the 22' enclosed trailer. :( That makes the FD seem like an economy car...

Dave

Havent driven it in 4/5 months...Great gas savings & less gray hair

I noticed a slight improvement in mileage when I added a downpipe. The other thing that wasn't mentioned yet is driving style. Go easy on the brakes. Try and coast to a stop when approaching a red light. This will give it more time to turn green, and if you do have to stop, you'll spend less time sitting there at idle, which burns more gas than when you are engine braking. In traffic, don't tailgate. If you keep some cushion you'll be less likely to constantly have to slow down and speed up.

Good for you. I have numerous customers with single turbo, street ported engines, 850/1680 injectors getting 24-25 mpg on the highway. This is of course is due to having the car tuned properly. Obviously going into boost drops the fuel economy drastically.

The RX7 is a high performance sports car and like all sports cars it drinks fuel. You get on the trottle, open the turbos up and the fuel economy drops, but the fun level goes up. Trying to squeeze every MPG out of it does not make it very fun to drive. Doing it once on a long trip is one this, but trying to be consious of only pressing the gas pedal 1/3 to avoid boost, is far too much like breaking in the engine. It is not fun to drive at all. A Prius will beat you off the light and still get better fuel economy.

You may as well remove the turbos all together and run the car N/A, then you could at least go higher in the RPM's, where the power exists.

HYDROGEN!!!! These are the best engines for it!
Now I havent built one for this vehicle yet, but I have built one for my 98, 4.6 ltr. Ford Expedition; as well as other units for other people. About 5 or 6 others. in fact. Its my side business that Im about to scale up for residential use. I went from an average of 18mpg highway to about 27/29mpg highway. I don't really count city cause I live pretty close to the highway and i find it not as important as the highway mileage but overall it rocks! 57% increase on my Ford. Holla if your interested!!!!

Another vote for a tunable ECU and get rid of that wing.

Yup. I average 24 mpg on the highway my single turbo with 550's and 1300's. But as soon as I floor it---> :rofl:

My FD helps the economy $$$$$$ :)

As a matter of fact i wrote a letter to BP telling the i had the answerer for their oil spill. Hook up the gulf of Mexico to my fuel rails.

guys you are complaining for 3$ per gallon...what should i say looking at the 7$ per gallon that gas is costing here in italy?

free tankers from the US anyone? :D

Bunch of babies! Gas is much higher here in Canada.

I do wish the car was better on gas because then I could spend more on go fast goodies.

PS the oem wing is sexy leave it on.

I picked up 5+ mpg after I sent my fuel injectors away to RCEng to get cleaned/serviced back in 2004 when I was still using my FD as a daily drive.

PFC and tune is best way to get better fuel economy.

I agree with Double J damn expensive up here, and really we are talking about the RX 7 here. Not the best example of fuel economy, if I can get over 300km a tank city driving I am grinning ear to ear LOL Drive the car and have fun with it for a few months then park it and drive something good on fuel.
If I need to go on a long trip I take the TDI Jetta, damn thing makes my 7 look like it has a 4 inch hole in the bottom of the fuel tank.

I would say pretty much what everyone else is saying,
Clean air filter, fuel filter, regular maintenance stuff
Get the injectors cleaned
O2 Sensor
DP ect ect

Honestly drive the car and have fun with it, if fuel economy is what you want you might need to look at a different car

Mike

In vac/cruise conditions, I tuned my PFC to run 16-17 air-fuel ratio. Ever since I did that I have been able to get about 24-25 mpg.... IF I totally baby it, and my motor is running hot (which for me is mid 80's *C water temp on the street). Have only taken measurements 3 times "babying" it. When it's colder outside, during the winter, I use more fuel. I typically drive my car very hard after warmed up, in boost every chance I get when there is no traffic, it's too much fun... and it drops to 15-20 mpg. These cars are not meant to putt around... as has been mentioned.

Only drive the car on the freeway on long trips...
Do not autocross it...
Do not drag race it...
Do not stomp on the gas pedal just to hear the killer exhaust you added...
Do not drive fast...
Keep it stock...well maybe a downpipe...

Oh wait - what fun is that? Why did you get this car?
What the h#!! ... enjoy it and be glad you're not paying European gas prices!

:)