gas milage increase???

[loknlode]

tuned the 89 carby up and was getting a consistant 34.2-4 mpgs out of it and was pleased with that. now I'm running 36.5-6 for the last 4 fillups. since the tune up the only thing I've done is run 4-6 cans of carb cleaner through the gas about every other fill up. I've used lucas and the cheap stuff at wally world ($1.54 a can).

I know the original owner never did that so I'm sure there is (or was) a fair amount of build up on the internals. has anybody else ran into this?


the ONLY other thing I can think of is that I do wind it out in 2nd and 3rd a good bit so I may have blown some carbon build up out of the cat./resonator.
it has no muffler.

[windy1]

better milege

affifmative. i run 1/2 can either dry gas,or fuel injection cleaner,every other tank,and every tank,in winter. i also use middle octane gas,not regular.
u could switch to synthetic oil. keep 34 lbs of air in tires. u can get up to 40mpg,or better.

[Christ]

I nailed 41mpg going up to syracuse and back. I was driving slower than the psl most of the trip, but it shouldn't account for an 8mpg increase.

I think we're on summer gas here, which has a higher btu content. That could account for part of it as well.

[litesong]

..... was getting a consistant 34.2-4 mpgs out of it and was pleased with that. now I'm running 36.5-6 for the last 4 fillups.

South Carolina has a fair number of 100% ethanol-free gas stations, but spotty in northern S.Carolina. Get some consistently. With careful 'before & after' records, 100% ethanol-free gasoline increased our 3 cars' mpg by 8%, 7-8%, & 5%. If you consider your mpg tanks of gasoline have been variable, you may have had a mixture of ethanol-free & 10% ethanol blend gasolines you've been pumping into your tank.

[Pu241]

I nailed 41mpg going up to syracuse and back. I was driving slower than the psl most of the trip, but it shouldn't account for an 8mpg increase.

I think we're on summer gas here, which has a higher btu content. That could account for part of it as well.

Don't be too surprised, droping your speed by even 5 mph can increase your MPG quite a bit.

I'm also not sure there is such a thing as "winter gas" anymore when most of the gas is actually 10% Ethanol contaminated.

[Christ]

I know all about speed changes and aero benefits, but a 5mph speed change doesn't fully.account for a 25% increase in FE when I normally drive quite conservatively anyway.

There are still winter/summer blends even with ethanol. It's an EPA mandate. One station actually used to tell us when they had each.

I also remember that I just recently increased my tire pressure to 40psi from 30... Which probably accounts for some of it, also. I might go to 50 psi on the way to hondaslayer's place this week.

When I delivered all those parts to FestYboy, I got 34.4 mpg for that trip, including several miles on 283 at 75-90 mph on 155R13 tires. I'm fairly pleased with my auto so far, and since slayers is 5speed, I may leave this one auto for a "community car".

[litesong]

I nailed 41mpg going up to syracuse and back. I was driving slower than the psl most of the trip, but it shouldn't account for an 8mpg increase.
I think we're on summer gas here, which has a higher btu content. That could account for part of it as well.

Sorry, but you have no 100% ethanol-free gas stations near Gillette. The closest 100% ethanol-free gas station is Montour Falls in New York & that is higher octane 89. As for your trip to Syracuse, there are some 100% ethanol-free gas stations in that region, again tho, only 89 octane. Only in Munsville, NY is there 87 octane 100% ethanol-free gasoline.

[Pu241]

Christ, you got 41 MPG on an auto!
I'm impressed! :notworthy:
Would agree; 33% increase in tire pressure, lower speed, higher BTU content fuel, and warmer temps probably all contributed!

[Dragonhealer]

If you installed a new O2 sensor on your tune-up, that also contributed, if not,
but you cured an over rich problem, the O2 may be getting better as fouling
is burning off of it!

[Christ]

If you installed a new O2 sensor on your tune-up, that also contributed, if not,
but you cured an over rich problem, the O2 may be getting better as fouling
is burning off of it!

Tune up? What's that?

[Christ]

Christ, you got 41 MPG on an auto!
I'm impressed! :notworthy:
Would agree; 33% increase in tire pressure, lower speed, higher BTU content fuel, and warmer temps probably all contributed!

I forgot about the warmer temps!

It was 80+ on the ride home... someone had a crash in Watkins Glen, so we were redirected for 6 blocks past the race library there... at 4 MPH stop and go. The temp gauge went to the high-side of the "normal" range, but no higher. I feel like I'm safe without a radiator fan and having half the radiator blocked by a trans cooler now.

I also came home ~130miles with a furnace taking up the passenger side of the car. I had to pull the pass seat and flip it around so the back was against the dash to make it fit... I'm sure that was helpful.

I need to start a fuel log, honestly. I've been going back on ecomodder.com a lot, and already added it to the garage, but I haven't been adding my fuel slips to it yet. They have a fuelly-type sig addition that gives up mileage figures including last tank, 90 day, and lifetime averages.

Would it be OK to have that in my sig here with a link to my EM garage?

[Pu241]

I need to start a fuel log, honestly. I've been going back on ecomodder.com a lot, and already added it to the garage, but I haven't been adding my fuel slips to it yet. They have a fuelly-type sig addition that gives up mileage figures including last tank, 90 day, and lifetime averages.

Would it be OK to have that in my sig here with a link to my EM garage?

Don't see that it would be any different from the fuelly link in my sig!
I keep a paper log in the car, which include all maintenance, so if I don't have time to do a net update I can do it later from the paper log! I just use a 3"x5" spiral bound note card for the log, cheap and small enough to fit in our expansive glove compartments!
We had a joint ecomodder festiva meet some time ago!

[Christ]

Sounds good. I always like to check because certain forums don't like sig links that aren't "mainstream" stuff in user's sigs. Never know when there's a bit of animosity or whatever between forums, right?

Whenever I hit a landmark like getting 40MPG, etc, it always makes me thrilled to do more work... so now I have to start working on the Aspire swap. lol

[Nikkitec]

Here in the Netherlands, where fuel prices of about $8,50 a gallon are commonplace some of us are trying to spend as little as they can on fuel.
I'm driving a 2000 Kia Pride 1.3 EFI with a 5 speed tranny and 14 inch rims and i'm getting around 48-50 mpg.
Mind you, the highest point in the Netherlands is a bit shy of 1000ft so it's really flat here, that helps al lot also.
Here it's possible to get RON 95 fuel (10% ethanol) but i do notice that it's a 25-30 mile difference on a full tank of gas, compared with the normal RON 102 that i normally put in the car.

But honestly, when driving around the Nurburgring i'm barely getting 25 mpg
but my foot is welded on the floor for most of the lap.

[georgeb]

43-45-42 last 3 fillups. 4-speed carby. Stock tires. Always go 65, including city!