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opinions and perspectives wanted
- Thread starter 89K5Blazer12
- Start date
Jessie James
1/2 ton status
You tell me.
I bought it last year and it had headers on it. I replaced the injectors, FPR, MAP, EGR, and a few other emissions related bits. Did a tune-up as well. Put in the stock 195 thermostat (and removed the 180 that was in there). I bought new tires (235's as mentioned). I put on a new stock 3" single exhaust with the stock muffler.
When the light goes green, I give it probably 5% to 10% gas and roll off slowly. It has plenty of power and I get up to speed just fine, but most people have zoomed off to wait at the next light. I don't do any freeway driving.
I fill up at Costco, occasionally mark down the mileage, and drive it until the next fill up and compare gallons to miles. That's how I figure out the MPG.
Just because other drivers floor it and pour gasoline down the intake doesn't mean I do, and doesn't mean I get the same crappy MPG they do.
I also get 24 mpg in town in my 2006 Mini Cooper S, which is rated at 22 mpg, but I drive it much quicker. I get 30 mpg when I am driving mellow.
So to summarize: Skinny tires, new correct equipment, and light on the gas pedal. If you're running massive tires, an exhaust that is too large and does not properly scavenge or otherwise has poor back-pressure, are geared wrong, have poor combustion, and like to floor it ... you're not going to get the same MPG.
Have you verified your speedometer with a GPS???
Gorillajeep
1/2 ton status
Yeah that is what I want to know?!
I know my BB in my Suburban (35's.4.56's.700r4) on the hwy is really not that bad like mid teens if I keep it under 65. If I go over that it drops exponentially! Around town even "hypermiling", (I think that is the term the Greenies use) doing everything but shutting the truck off at a stop light the best I ever got was about 10mpg.
Jessie James
1/2 ton status
It's off by about 4 mph at 65. So when it says I am doing 65 I am really doing 61.
Does that mean I really am only getting 14 mpg? Less?
No, if your calculations are correct, your speedo/odo are off by about 6% (which isn't much IMO), so your economy would only be off similarly the same amount. 18.8MPG?
Honestly, still beyond reasonable mileage no matter how you drive (downhill both directions?), but if you've checked the speedometer, and it's that close to accurate, something else is going on so that you see that sort of mileage. I physically don't see how, but that's meaningless, you say you are and who am I to call BS?
Next time you are taking a decent trip (over 100 miles) that you can do all freeway between fillups, I'd love for you to report back how many gallons it took for you to go from X on-ramp to X off-ramp. Unless that things a hybrid, your highway miles are going to have to be even higher if you have the same driving habits.
Honestly, still beyond reasonable mileage no matter how you drive (downhill both directions?), but if you've checked the speedometer, and it's that close to accurate, something else is going on so that you see that sort of mileage. I physically don't see how, but that's meaningless, you say you are and who am I to call BS?
Next time you are taking a decent trip (over 100 miles) that you can do all freeway between fillups, I'd love for you to report back how many gallons it took for you to go from X on-ramp to X off-ramp. Unless that things a hybrid, your highway miles are going to have to be even higher if you have the same driving habits.
Jessie James
1/2 ton status
Personally I think having the headers on there helps it run more efficiently. That's the only modification on there, and everything else is stock. And I seriously drive it easy off the line, which is where most gas is wasted. I don't think people appreciate how much gas you waste when you floor it off the line, especially in a big engine like this in a heavy truck like this.
Next time I fill up I'll make a note of the mileage and will download and turn on a GPS tracker. The only problem is that I only drive it occasionally, so this may take a few months! The last time I filled it up was in July and I still have 3/4 of a tank!
And I don't do long trips with it ... there is no reason to. My Mini gets 30 mpg on the freeway, so I may have to disappoint you there.
Next time I fill up I'll make a note of the mileage and will download and turn on a GPS tracker. The only problem is that I only drive it occasionally, so this may take a few months! The last time I filled it up was in July and I still have 3/4 of a tank!
And I don't do long trips with it ... there is no reason to. My Mini gets 30 mpg on the freeway, so I may have to disappoint you there.
I've got headers, Vortec heads, roller cam, and tuned port injection. Still don't see mileage any better than I used to with carb.
89K5Blazer12
Registered Member
thx for all the continued info. rebel gregory, thx for listing off what you did your truck. the big thing i'm trying to decide right now is whether to go dual 2.5" exhaust or single 3".
again thx to all of you for chiming in on the topic.
again thx to all of you for chiming in on the topic.
