13 mpg

[A7RXY]

Oops............just filled up, since the last fill I have done 131 miles, and put in 45.89 litres, so I make that 13mpg..........bring back my porsche.........I hate that taxman........I must say that when I fitted the new carb I just bolted it on and it started so I left it alone, and I have only done 131 miles since then, most being short trips. I\'ll try to take it on a run to see if it is any better, watch this space.

[rei99]

The Black one with 13B and holley, is on 19/20mpg without pushing too strong, but not like a grandfather  the 1981 restyling, is less, something better your and lower expecially when I drive it on my town with a lot of hills..

[shaunwil]

I\'m getting between 16 to mid 20\'s on the LPG !

Shaun

[David Nock (RIP)]

23.4 average since mid 2008. Bit more summer, bit less winter, avoiding short trips all the time. You need to keep brimming it and computing the distance against fuel over a longer time than 1 fill though.

I do drive like a grandfather as well. I am a grandfather, maybe that\'s why.

I never understood how adjustments of idle speed/mixture would affect the main running consumption. Surely the fixed jetting does that? Does it affect it much? Anyone know?

Time to focus on air filter and plugs Dibs? Brakes binding? Also the famous 1st Gen leaking fuel tank syndrome, though I think you\'d know if that was the problem.

Did we establish that the carb has to be set up to go to all 4 barrels on hard acceleration only?

[mpk490p]

if i see 13MPG i do a dance

[A7RXY]

When I first got this car in 1989 I was getting 24/25 mpg but then it was only a few years old, my sers 1 back in 81 regularly did 25 mpg.

  David it has a new filter and plugs plus the brakes are all new aswell. So log started and lets see how it goes.

[johnf]

I\'m getting between 16 to mid 20\'s on the LPG

That sounds poor for LPG compared to a piston conversion.

[Ian65]

My red 1st gen doesn\'t even do 13mpg. I limit the amount of driving I do in it because the fuel costs are crippling.
I\'ve put £40 in it in the last 2 days and I haven\'t really been anywhere.
I\'ve never had such a thirsty car, my other 1st gens didn\'t drink it like this does.
It comes to something when I have to take a 4 litre supercharged V8 Jaguar instead because it\'s much more ecomonical. I get 21 around town in the Jag driving normally, slow and fast driving.
It\'s not as if the Mazda has earth shattering performance to go with the consumption...
I might have a dabble with the mixture although I\'ve had nightmares with these Nikki carbs before.
At least the car runs at the moment, which it might not do if I mess with the carb...

[A7RXY]

I\'m realy suprised by some of these figures, as I was expecting you all to say that you were getting the low 20\'s, as Ian says I\'m also loathed to mess with the carb settings as the car seems to be running ok.

[shaunwil]

That sounds poor for LPG compared to a piston conversion.

It\'s a basic impco carb setup without the vac advance working. It\'s runs quite rich on tick over. Been using it every day for about 3 years now

Shaun

[myatt1972]

I get about 15mpg but my secondaries are mechanical not vacuum operated.

[mooragerx7]

i was getting up to 17 mpg in mine when it ran ( if i dont drive spiritedly)
 
got about 24mpg when i first bought it follwing in the slip stream of my dads car and trailer with the other rx7 on it all the way from exter to cambridgeshire dads car was doing 30mpg and thats a 1.8 petrol laugna

[Ian65]

I think the low 20\'s like Dave gets and Dibs used to get should be about right for a well maintained car in top tune just driven normally ( not thrashed everywhere)
When we bought these cars in the 1980\'s, they were still pretty new and had probably been main dealer maintained and were unmolested.

When we are now picking up 25 year old cars, anyone could have messed with the settings, tune, etc, etc... over the years

Dibs, your car is very standard and with that brand new bobby dazzler of a carb, should tune up very close to how it was originally.
If it was running very rich though, you\'d have thought that the mot would have picked it up, same with mine really.
I must be trailing a haze of fuel out of the back like a Vulcan bomber!
Green it ain\'t!

[jon newman]

Thats really sad, 13 mpg, my rx3 with a 13b and 48 ida at 80 will do  23, could get more but thats another story, driven hard it is in the single figures, but rewarding. my s1 rx7 was ok but bland in comparrison, now has ida too, has any one tried a 16v mk 2 golf gti?
 a far superior car - as standard, 139 bhp, 1.8 0-60 in 7.9 and similar in price, runs circles round a first gen handeling wise.  I had 4 mk2 s between 97 and 2009 and still have urges from time to time. A7 id get a compression test done and then have another look at your carb.

[mpk490p]

to be fair i run it fairly rich with the 51IDA