RX 4 Speed

Just curious... on a FULL gas of tank, about how many miles do you guys get on your FD in city driving? (including occassional highway to get to work of course) I was just wondering since I have been noticing that maybe I have been getting less than average MPG lately... that maybe I have a bad O2 sensor, plugs, etc...

I usually fill up when the needle is below 1/4, and I usually get around 250 - 275 miles on the tank. My driving style consists of occassionally hard boosting (~7K), but mostly mild mannered. Is my mileage something I should be concerned about? Thanks...

PhoenixDownVII

Whats your exact MPG?

At 1/4, I'm usually between 200-230. REALLY depends how much city vs. how much highway driving.

I usually don't drive the FD to "Cruise" though, only if I can be "Spirited" some of the way out.

If you are between 16-18mpg you're fine. Well, depending on how modified your car is.

adam c

iTrader: (2)

These cars get lousy gas mileage. Sounds like you are doing better than average. I get about 11 mpg, driving mostly around town.

Mahjik

iTrader: (1)

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/gas-mileage-276763/

RX 4 Speed

That's the thing, I don't know what my exact mpg is. It's mostly because I let her idle before I drive her, and then I usually stop somewhere scenic and take pics, and then I leave her running So I can't really calculate it accurately. So does that mean that getting 250 on 3/4 of a tank, while boosting, idling is actually pretty good??? WOOOHOOO to me then!

My mods are in my sig... mostly stock, except for reliability...

PhoenixDownVII

Nice. A post implying a search to a thread where you posted more threads implying to search that once again you posted more threads...

I had 4 Rx7club windows open at one point :P~

RX 4 Speed

WHOA! 11 mpg? Really? then I must be doing okay then... what mods do you have? I am guessing way more than mine.

I just posed the question to check whether I should be investigating further... Should I bother getting a new O2 sensor? I think if it's bad, doesn't the check engine light come on? I guess I'm with "if it ain't broke, don't fix it"...

PhoenixDownVII

You can measure exact MPG though.

Fill up, top out. (Hit your trip to 0)
Drive.
Fill up, top out again.

Divide Miles traveled (230-250?) by gallons used (check the pump, silly) and viola!

230-250 at 1/4 tank left is average and very good.

I've priced out an 02 Sensor and...well...don't get it. LOL. If you're averaging 16-18mpg with mixed driving you are fine, "Ain't Broke, Don't fix it" as you said...

RX 4 Speed

I did too... 4 windows open. Regardless though, thanks Mahjik. It looks like I have nothing to worry about as far as mileage goes.

RX 4 Speed

Bro, yes, I do know how to calculate mpg... but like I mentioned before, I probably have the car idling a total of 1- 2 hours during an entire tank, since I idle her before I drive. Thus, mileage doesn't rack up, but I would think that it would contribute a lot more to gas usage...

1QWIK7

iTrader: (33)

LOL i hate those neverending search threads where one thread leads to another, then another and so on..

but yeah, i do mostly city driving and i get about 275 on a full tank..well thats how much i got last time..

Force13B

iTrader: (19)

I get about 280 miles to a full tank, about 16-18 mpg. You have to be very gental, and not hall *** everywhere.

F0RSAKEN

Ive gotten over 340 miles on a tank before....once My average is 280-300 though, with mostly highway/little city driving with the occasional exercise of the cars power. Average I get 16-20 mpg with a mostly stock car (almost same mods as you RX). So IMO you're fine.

QEric84

i get bout 180-220 mpg without pushing the car

BoostFrenzy

I get crap, but after reading this thread and others, I guess ti's normal, I get 10-12mpg in town with much stop & go, off boost, 5-8 mile trips

fd3typer2

My first car consistently did 220 miles on a full tank with a stock ECU and regular urban driving.

My current car did 250-300 miles with the stock ECU and now does 230ish with the Mine's ECU.

When I go to 13psi of boost I will let you know the difference in consmption.

jimlab

Well, you'd be surprised how many people don't. Not to mention how many people think their gas gauges are perfectly accurate...

FWIW, I averaged about 11-13 mpg in town and 20-21 on the highway.

rotarycrazy

iTrader: (8)

I manage to get up to 25 miles to the gallon with comes out to be 400miles for a tank of gas I know it unbelievable but its true and if Im more in the city than highway it get about 21 witch it would be around 340

RX 4 Speed

So true Jim... I will have to agree to that

XSTransAm

I think i get around 21mpg on the highway. gotta love stock 550 primarys and 1680 secondarys

RX 4 Speed

^^ You must not know where the gas pedal is Just kidding...

For real? wow... you must hardly boost, if at all.

RX 4 Speed

Ya, I would reckon I'm okay... I figure I get no more than 20 mpg in the city. I rarely go on long trips, for 3 hours or more a pop, which is a shame since that's when I would (should) get 25 mpg or so.

cmartinp28

i get about 11-13 city driving and about 16-18 highway on a ported motor and single turbo without boosting, using 750cc and 1680cc inj.

i dont want to think how fast the needle will fall when i get the car tuned and start flooring and hitting high rpm

poss

iTrader: (5)

As said earlier, it is almost totally dependent on what kind of driving you do. I have gone as high as 26mpg on the highway and as low as 11 while driving to work and back in heavy traffic.

Mahjik

iTrader: (1)

Which illustrates how many times the topic comes up.....