Best gas mileage ever
05-08-08, 07:14 PM
#26
I currently get about 15 mpg. This is mostly city, and very lead-footed. It is also with a floor-sweeper rebuild I put together with used everything except apex seals. It also "idles" at 1500+ RPM. I have yet to drive it any distance on the highway with this motor.
Withe my old engine, which was a professional rebuild, I got damn good MPG. Lead footing it and doing fast back-road runs I never got below 18 mpg. My best ever was 28 mpg, and half of that was spent cruising at 85-90 with the windows down, with some in-town driving. I could have definitely pulled off more than 30 mpg if I had tried. This is with stock ECU and a motor with a largish streetport and ported exhaust.
Withe my old engine, which was a professional rebuild, I got damn good MPG. Lead footing it and doing fast back-road runs I never got below 18 mpg. My best ever was 28 mpg, and half of that was spent cruising at 85-90 with the windows down, with some in-town driving. I could have definitely pulled off more than 30 mpg if I had tried. This is with stock ECU and a motor with a largish streetport and ported exhaust.
05-08-08, 07:35 PM
#28
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Also, I have noticed over time, since I have stopped speeding like an idiot, that just going the speed limit and keeping the throttle as still as possible has helped. I used to have a radar detector and would speed almost everywhere, keeping a lookout for the po-pos. Everytime I saw a car that might have been a po-po I would let go of the gas and even smash the brakes sometimes. Back then I never used to think about how bad that was really hurting my gas milage. haha
05-08-08, 11:50 PM
#31
I think my S4 GTU is getting better city mileage than my old S5 GTU which I guess makes good sense since the S4 is lighter. I generally saw 15 mpg city in the S5 and 23-24 highway if I didn't go too fast. That dropped about 1 mpg in the city when I put in a rebuild with a street port, maybe because I tended to drive with heavier foot? In the S4 I tend to see about 16 city. My S4 also has the "aero" package which supposedly drops the drag coefficient down to .29 from .31 or so... I wonder if this will actually help my highway mileage. I have yet to take this car on a long enough trip to measure a full tank of all highway.
Yes, the S5 tank is larger which would explain the longer cruising ranges but not the claims for better overall mpg.
Not calling "bullshit" Fumihiko, but I'd love to know how you got 33 mpg.
Oh, and it really makes me sad that my other car, a 2002 Dodge Caravan that weighs a good 1000 pounds more and has more power than my NA 7 gets a little better gas mileage. I think we know why the rotary never conquered the world.
Yes, the S5 tank is larger which would explain the longer cruising ranges but not the claims for better overall mpg.
Not calling "bullshit" Fumihiko, but I'd love to know how you got 33 mpg.
Oh, and it really makes me sad that my other car, a 2002 Dodge Caravan that weighs a good 1000 pounds more and has more power than my NA 7 gets a little better gas mileage. I think we know why the rotary never conquered the world.
05-09-08, 12:47 AM
#34
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I'm pretty much consistent in getting about 15mpg or less. No matter how I drive (quick acceleration and short gear shifts, slow acceleration and shifting at 3k, slow acceleration and shifting at 2k, quick acceleration shifting at 2.5k and 3k, you get the idea), whether it's freeway or city...
05-09-08, 12:55 PM
#37
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S4 GXL 5-speed, my 36mile one way to work was 21.5, which is 50% interstate and 50% county road. So imagine my surprise when my wife and I ran I-75 from Cincy to Gatlinburg, 75-80mph, and she came in @ 26.
Nice.
Nice.
05-09-08, 01:12 PM
#38
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Well i got vacum leaks, a check engine light, i got a new O2 sensor, and if by tune up you mean spark plugs and wires i did that too, i got anew fuel filter and did the injector cleaner (The gas mix), i need a new air filter but i doubt thall make a huge difference. By Rtek you mean an after market computer to tune the ecu? I was looking that up but i dont have 1k to spend on an ECU
When i do the check engine i get so many random errors, i just assume is a major vacum leak, i dont know how to deal with the rats nest should i just remove it like everyone else is doing? I dont know how to deal with vacuum leaks
05-09-08, 02:28 PM
#39
Well i got vacum leaks, a check engine light, i got a new O2 sensor, and if by tune up you mean spark plugs and wires i did that too, i got anew fuel filter and did the injector cleaner (The gas mix), i need a new air filter but i doubt thall make a huge difference. By Rtek you mean an after market computer to tune the ecu? I was looking that up but i dont have 1k to spend on an ECU
When i do the check engine i get so many random errors, i just assume is a major vacum leak, i dont know how to deal with the rats nest should i just remove it like everyone else is doing? I dont know how to deal with vacuum leaks
When i do the check engine i get so many random errors, i just assume is a major vacum leak, i dont know how to deal with the rats nest should i just remove it like everyone else is doing? I dont know how to deal with vacuum leaks
PULL ERROR CODES! Find out what the hell the computer thinks is wrong with your car and fix them! The Rtek has a readout for error codes, but there is a method posted on this forum to find them if you don't have an Rtek. Go through each and every one of the error codes and fix them. Don't assume it's anything else. No one said owning a cheap FC was easy.
A vaccum leak means there's an air leak. Find out where they are and replace all the hoses/lines around it to seal off the leak. If it's a gasket leak from the exhaust, get a new gasket.
05-09-08, 02:31 PM
#40
I noticed the S5 cars consistently are getting way more MPG than S4 cars. I am also seeing the Vert S5's are very high MPG..why is this? the Verts are the heaviest model out there... are you guys automatics?
Do you think there is a reason S5's get better MPG? Is it the AFM design?
Do you think there is a reason S5's get better MPG? Is it the AFM design?
higher compression ratio = better engine efficiency = better MPG
Ideally a high compression turbo motor would yield you best MPG if you could stay off the boost when it wasn't needed.
The compression ratio could explain the difference between S4 and S5, but I just thought of a reason why they could, in theory, get better gas mileage. They run a 3.9 R&P compared to my coupe's 4.1 and my GTUs' 4.3. My coupe gets better mileage than my GTUs so it could be conceivable that verts would get better mileage than my coupe.
05-10-08, 01:14 AM
#44
talking head
I got 45 mpg the other week when I towed the RX7 on a trailer for 160 miles, using my trusty Peugeot 306 turbo Diesel.
I can get over 3 times the distance on the same amount of fuel normally using the PUG over the RX7. I'm thinking LPG could be the way forward with the RX7 with fuel prices over here.
I can get over 3 times the distance on the same amount of fuel normally using the PUG over the RX7. I'm thinking LPG could be the way forward with the RX7 with fuel prices over here.
17 - 20 L per 100 Km LPG ( propane and butane oz mix )
( hard city driving, its considerably better highway driving )
or
4.5 to 5.3 US gallons per 62 miles
( 11. 6 to 13.7 mile per gallon LPG )
in real terms, its the equivalent of a 9 - 11 L per 100km city cycle
modern Japanese 2L using premium
or
2.3 - 2.9 gallon per 62 miles
( 23 - 27 mpg US petrol ) city cycle
there is also a few hidden advantages besides the octane rating
( its faster and smoother than you would initially give it credit for )
- and i have plenty of experience with hard tuned EFI rotary turbos
so i am a fair judge
simple impco 225 closed loop kit with model E converter , and 60 L underfloor tank
Last edited by bumpstart; 05-10-08 at 01:24 AM. Reason: imperial conversion
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