havnt owned the car for long but ive seen about 16mpg city driving.

100% stock atm cept for stereo.


with a new intake and exhaust decrease or increase mileage?

 

20mpg city/highway mix.
Punched out cats and thats about it...
and this is from an auto XD

 

26 is my best (mostly highway), and normally little less than 20 around town.

GXL with 130k mi, gutted cats, single straight through muffler, cone filter, no AC, no power steering, and attentive maintenance.

 

15-20 mpg...is my average.......crappy compared to my 30+ mpg hyundai....but then again, its a hyundai rotarys are the vampires of the car world!! a vampires thirst for blood is a rotaries thirst for 91 octane!! (im in cali, so 91 is the best i can do!!)

 

seems like everyone gets better MPG when they take out their cats.....maybe i shoudl too

 

I notice nobody consider the tire width to be a factor in mileage? I have no numbers to back it up - my 86' NA went from bad to worse when switching from stock 195 to 225/45-18. But the fun factor improved =)

 

more mass to spin but the difference should be marginal, keep in mind not all tires are created equally as well. you could find a tire that is the same size and diameter that weighs twice that of another but light wieght tires are not always necessarily better(thickness, composition and durability)...

gutted cats usually will improve gas mileage assuming you can lean out the fuel mixtures to match the freer flowing exhaust.


i don't even have my O2 hooked up and i get better mileage than most 7 owners and mine is a modded turbo.

 

I just burned 1/4 tank of gas in my 86 rx7 cosmo re t04s bla bla in a mear 21 miles............

Thats all my fault though, my widband is no straner to 9.xx:1 afrs lol


If i keep out of boost, ive gotten just over 200miles to my s4 gastank

-Jacob

 

Funny you should ask: '88 'vert - I just checked at my last fill-up. No freeway. I drive 7 miles one-way & shut 'er off mon thru fri. Avg. city = 13mpg. I do let her hit 5k a couple of times 'cause she really likes it...
Best freeway avg. mpg = 19.

 

I Dont have a clue as to my mpg i cant keep my strainer and filter unclogged long enough to find out!! I'm thinking around 12 to 17

 

My 1988 is still stock and I got around 23-24 driving it from CA to IL. Not bad going through the mountains. Just replaced the AC comp. so I'm sure it'll go down now.