Your Fuel Economy - Post Here Reply #30 – June 08, 2007, 04:52:01 PM '85 Mercury Cougar3.8LStock[/I]2.73 gearsC5[INDENT][/INDENT]City: 14-18 mpgHighway: 20-24 mpg[/B]'87 Ford Thunderbird3.8LStock[/I]3.27 gearsAOD[INDENT][/INDENT]City: 17-21 mpgHighway: 24-28 mpg[/B]I drive like a granny, and go ~70 mph on the interstate.As an buttstuffyst, my opinion is a "Top 10" mpg would be baseless. There are far too many variables to be accounted for.Eric, keep us informed of what kind of mpg the car gets once you use a larger amount of gas per fillup (15-18 gal). Quote Selected
Your Fuel Economy - Post Here Reply #31 – June 09, 2007, 04:08:08 AM 20-22 all city/rush hour, 24-27 average, 30 highway at "75mph", 33mpg at "65mph". Actual speeds are a little higher as my speedometer/tripminder reads low with these tires. Typically do round trips to Federal Way, WA (145 miles each way) on 9.5 gallons of gas which is a mix of anywhere of 60mph to 80mph.and of course, 8-13mpg climbing hills, 130mpg going back down them. 2mpg at WOT.Standard 5.0 SO, 213k mi, but with HO intake parts. Still fails emissions though, even with every smog system working great (its all a year old now though, along with all vacuum lines). Next year I may have to stick some of that "emissions fuel treatment" in there before I run through so I don't have to deal with getting another waiver from a repair shop on their list (all overpriced). Quote Selected
Your Fuel Economy - Post Here Reply #32 – June 09, 2007, 07:35:27 PM I got around 26 on the freeway with my old 86 5.0 aod.both 87 3.8 aod cougars got about 450 miles to a tank... I cant seem to remember how big the tanks were though. And I usually used all but the last gallon. Quote Selected
Your Fuel Economy - Post Here Reply #33 – June 09, 2007, 10:51:56 PM 85 XR-7 32 hiway ,avg 2491 SC 5 speed 27 hiway,avg 20 (heavy foot)95 XR-7 4.6 28 hiway,avg 20then i just have my trucks 76 F250 4x4 460 14 hiway and avg 8,78 bronco 351M with 35's 10 hiway 7 avg they don't see much driving lately Quote Selected
Your Fuel Economy - Post Here Reply #34 – June 10, 2007, 12:40:17 AM So far it seems like most people with these cars are still getting fuel economy within the EPA estimates from when they were new (and not the new revised versions). Cool. Keep 'em coming!Just an update...I finally filled up the '84 after the trip...160 miles, 7.4 gallons = 21.62 mpg.So for the trip, 480 miles and 17.2 gallons = 27.9 mpg. Quote Selected
Your Fuel Economy - Post Here Reply #35 – June 10, 2007, 02:33:44 PM 22-24 city MPG with foot in it doing 0-50 off every light because theres nothing better than smoking imports and knowing you get the saem or better gas milage.high way 30 or better depends on driving speed and traffic Quote Selected
Your Fuel Economy - Post Here Reply #36 – June 12, 2007, 04:24:36 PM Is that a bit exaggerated? I would hope for such mileage once I get a new motor (and HO), but I don't see a HO, even stock, getting 30mpg on the highway with 3.73's. The most accurate way I can get readings for these cars is to count the actual miles manually (tires, gears/gearing, etc can give you numbers that are far from reality), then divide by the gallons used shown by the tripminder (since fillups to "full" vary). I just can't see a HO, even with 2.73's, getting 30mpg at anything above 45mph (where the old highway numbers were ran at).If I'm wrong, great. It means I can get more power and a new/quiet rearend with the exact same economy as the stock SO (with electric fan, tuned great, ...). Just curious, thats all. Quote Selected
Your Fuel Economy - Post Here Reply #37 – June 23, 2007, 09:01:26 PM finnally ran a few tanks through the cougar:D 23ish in town 28-32ish freeway average shown below Quote Selected
Your Fuel Economy - Post Here Reply #38 – June 24, 2007, 12:43:34 AM I've gotten 26.2 on a trip to Carlisle and 22 running around up there which included a couple trips to Harrisburg... The trip was mostly 60-65 mph and and I have 3.73s... Never check it around here, as I put just enough gas in it to race before I head for the track... Quote Selected
Your Fuel Economy - Post Here Reply #39 – June 26, 2007, 12:35:21 AM Eclipse 22/25 City 25/32 HwyCougar Used to be 16/18 City 30 HwyNow who knows? If I run off two barrels it will probably be better due to a less restrictive engine. If I run it hard I would expect 10/12 City 16 Hwy Quote Selected
Your Fuel Economy - Post Here Reply #40 – June 26, 2007, 12:29:34 PM I average 17-18 MPG in mixed highway & backroad driving.I get about 21 MPG in steady highway driving @ 65 - 70 MPHI have the injector's dialed in properly with the TwEECer so my Tripminder is fairly accurate now (+/- 2MPG), though I generally found it to be excessively optimistic in stock configuration, so don't mind me if I take those numbers with a grain of salt.I read a post where someone claimed to see a significant mileage improvement by using the "decel fuel shut off" feature in the ECU, so perhaps I can improve my mileage somewhat by doing that. I may also adjust it so that I am running slightly leaner than stoich at light-load cruising. Quote Selected
Your Fuel Economy - Post Here Reply #41 – June 26, 2007, 02:11:46 PM i'm having issues with the engine stumbling when i gas on it, so i bumped the timing to 14 deg and use 93 octane.... i drive a mix of stop and go and ingterstate.... i average 20.3-20.6 according to my tripminder, but the pump says i'm closer to 19 mpg Quote Selected
Your Fuel Economy - Post Here Reply #42 – June 26, 2007, 02:28:21 PM Quote from: Cougar5.0;156946I have the injector's dialed in properly with the TwEECer so my Tripminder is fairly accurate now (+/- 2MPG), though I generally found it to be excessively optimistic in stock configuration, so don't mind me if I take those numbers with a grain of salt.How much so, percentage wise? Quote Selected
Your Fuel Economy - Post Here Reply #43 – June 27, 2007, 11:42:09 AM In my experience, the tripminder is dead on with fuel usage, the miles then depend on how accurate your speedometer is (no speedometer is 100% accurate, but you can get close with the right tires/parts). When I put on snowflakes, I meant to get the cheaper and same size radius as my old 14's - 225/55R-16 but accidently bought factory 225/60R-16's so now I get 62-63mph speeds at 60mph readings than what I manually calculate it. Haven't touched the speedometer gear as I want the cheaper and more widely available 55's next time I need tires.Anyone know how accurate these were on the factory cars they came on, in stock form? Quote Selected
Your Fuel Economy - Post Here Reply #44 – June 28, 2007, 11:50:55 AM Quote from: Cougar5.0;156946I read a post where someone claimed to see a significant mileage improvement by using the "decel fuel shut off" feature in the ECU, so perhaps I can improve my mileage somewhat by doing that. I may also adjust it so that I am running slightly leaner than stoich at light-load cruising.You can post-process a TweecerRT log to find predicted mpg gains. I believe the "Decel fuel shutoff" is active when the engine is warm, the TPS is closed, and the rpms are above 1200.If you filter out injector PWs to 0 when these conditions are all true, sum them, and compare the total PW to your non-filtered results, you can find a percent different. You can also find total distance traveled to get an actual mpg number.You can go through the same process to find the improvement by changing the HEGO bias. Quote Selected
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