MPG Q's

Patrick Boetticher · 03-10-2002, 02:11 PM

ok i need some tips on gettig better fuel HWY economy (IF POSSIBLE) timing is back down at 10 fuel pressure is at stock setting.... i still have 3.08 Rear end gears and im still getting 12-13 MPG... stock on the freeway i used to get 19-20 is it possible to get any better that 12-13.... (by freeway i mean cruzing at70-80 in 5th the whole way)

thanks

5ohCOUPE · 03-10-2002, 09:08 PM

WOW, I get 21 MPG on the highway and 12 MPG in the city beating on it. I really dont do anything to make any changes to my MPG. I still have 19# injectors running at 42 PSI and im at 14 degres timing.

Patrick Boetticher · 03-12-2002, 01:53 PM

any more ideas????

please... i just added a Stock replacement KN that i got for free so im gonna see how that works on my week.ly treck to the valley (all freeway 50 miles)....

Skyman · 03-12-2002, 02:01 PM

I get 19 freeway with 3.73s at 75mph.

I run 18 degree timing and 32psi fuel pressure on 24lbers.

Make sure your car is in good tune and give it more timing!

Skyler

Chris_H · 03-12-2002, 03:25 PM

When was the last time you gave the car a good tune up?(plugs, wires, pcv, ect....) I was getting like 12-15 when I first bought my mustang and once I gave it a good tune-up, to include the bad O2 sensors that were on it, I jumped up to 22-25. I think the kicker was the bad O2 sensors. Once I got those change out, it made a world of difference. Not that its your problem, just some suggestions. Hope you get it worked out.

Chris

whiterod · 03-12-2002, 05:14 PM

I would also put in a thermostat (signature), if you don't have one in and you run that cold the computer is going to run open loop and consequently run real rich. try a 180 degree

PatrickMx · 03-12-2002, 05:59 PM

You are going to stroke on this one. I drive 50 hard miles one way to work. Generally 40 of it are country/hwy 4lane. The last 10 are in the city. I travel at or above 75 on the hwy. I get 21/22 usually. My last race I drove 146 miles round trip to the track. Made 13 passes on the 1/8th mile track. Most of which were 8.30's (full 1/8th at 84mph). I got 21mpg round trip. On that cruise I usually get 26-27.9 maximum but travel only 55-65mph (filling up at the trackside). I have 3.55's and the car is 3127 with me in it. 351 heads, 19lb injectors and an EEC tuner with A9L EEC. Figure that one out. My last good v8 stang was a Stock 89 with 3.08 gears and never got over 23 or so and I treated it as if it were a hurse. My EEC tuner is set for a little leaner tune (hwy) but before this I was getting nearly the same mileage on it before the head/intake swap. Before I could muster an 8.80 on the stock engine. The engine came out of a stock 88gt with 99K miles showing when it was wrecked. The plug wires were 88 vintage as well as needing oil pan and valve cover gaskets. It will smoke decently on a 75 shot to show it's age. This car is an 83 fox coupe converted to mass air EFI from an 89. Talk about a builder.

Patrick Boetticher · 03-13-2002, 03:46 PM

i gave the car a complete tune up not 500 miles ago (exept the O2 sensors) and i just therw the thermostat in and the KN and i still got crappy MPG... im gonna go get new o2 sensors today....

Patrick Boetticher · 03-14-2002, 01:07 PM

03-10-2002, 02:11 PM	#1
Patrick Boetticher Registered Member Join Date: Feb 1999 Location: Camarillo/Thousand Oaks Ca Posts: 223	MPG Q's ok i need some tips on gettig better fuel HWY economy (IF POSSIBLE) timing is back down at 10 fuel pressure is at stock setting.... i still have 3.08 Rear end gears and im still getting 12-13 MPG... stock on the freeway i used to get 19-20 is it possible to get any better that 12-13.... (by freeway i mean cruzing at70-80 in 5th the whole way) thanks __________________ Mustang Sold 2003 Ranger Edge

03-10-2002, 09:08 PM	#2
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	WOW, I get 21 MPG on the highway and 12 MPG in the city beating on it. I really dont do anything to make any changes to my MPG. I still have 19# injectors running at 42 PSI and im at 14 degres timing. __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

03-12-2002, 01:53 PM	#3
Patrick Boetticher Registered Member Join Date: Feb 1999 Location: Camarillo/Thousand Oaks Ca Posts: 223	any more ideas???? please... i just added a Stock replacement KN that i got for free so im gonna see how that works on my week.ly treck to the valley (all freeway 50 miles).... __________________ Mustang Sold 2003 Ranger Edge

03-12-2002, 02:01 PM	#4
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	I get 19 freeway with 3.73s at 75mph. I run 18 degree timing and 32psi fuel pressure on 24lbers. Make sure your car is in good tune and give it more timing! Skyler __________________ 2001 BMW M3 6spd 12.79@108 RIP ---- 1993 Notch w/ 98 4V 4.6 Fasttt... -1989 Saleen Mustang #406- 12.32@109 -1999 Black Cobra Coupe- JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.

03-12-2002, 03:25 PM	#5
Chris_H Registered Member Join Date: Oct 1999 Location: New Mexico Posts: 488	When was the last time you gave the car a good tune up?(plugs, wires, pcv, ect....) I was getting like 12-15 when I first bought my mustang and once I gave it a good tune-up, to include the bad O2 sensors that were on it, I jumped up to 22-25. I think the kicker was the bad O2 sensors. Once I got those change out, it made a world of difference. Not that its your problem, just some suggestions. Hope you get it worked out. Chris __________________ 1987 LX, Best times: 13.47 @ 102.49, 1.80 60ft 6900' DA

03-12-2002, 05:14 PM	#6
whiterod Registered Member Join Date: Sep 2001 Location: zachary, la Posts: 73	I would also put in a thermostat (signature), if you don't have one in and you run that cold the computer is going to run open loop and consequently run real rich. try a 180 degree __________________ GT-40X(58cc)heads, cobra upper&lower, FMS 65mm TB, 75mm Bullet, 24# injectors, 190 lph fuel pump, moroso cold air intake, BBK 1 5/8 equal length headers, flowmaster cat back, 1.7 cobra rockers, crane 2031, T5Z gear box, centerforce dual friction, mcleod bullet proof bellhousing, 3.55 gears, hurst billet shifter with over 193,000 miles. thanks to all who contributed

03-12-2002, 05:59 PM	#7
PatrickMx Registered Member Join Date: Jan 2002 Location: Mississippi Posts: 23	You are going to stroke on this one. I drive 50 hard miles one way to work. Generally 40 of it are country/hwy 4lane. The last 10 are in the city. I travel at or above 75 on the hwy. I get 21/22 usually. My last race I drove 146 miles round trip to the track. Made 13 passes on the 1/8th mile track. Most of which were 8.30's (full 1/8th at 84mph). I got 21mpg round trip. On that cruise I usually get 26-27.9 maximum but travel only 55-65mph (filling up at the trackside). I have 3.55's and the car is 3127 with me in it. 351 heads, 19lb injectors and an EEC tuner with A9L EEC. Figure that one out. My last good v8 stang was a Stock 89 with 3.08 gears and never got over 23 or so and I treated it as if it were a hurse. My EEC tuner is set for a little leaner tune (hwy) but before this I was getting nearly the same mileage on it before the head/intake swap. Before I could muster an 8.80 on the stock engine. The engine came out of a stock 88gt with 99K miles showing when it was wrecked. The plug wires were 88 vintage as well as needing oil pan and valve cover gaskets. It will smoke decently on a 75 shot to show it's age. This car is an 83 fox coupe converted to mass air EFI from an 89. Talk about a builder.

03-13-2002, 03:46 PM	#8
Patrick Boetticher Registered Member Join Date: Feb 1999 Location: Camarillo/Thousand Oaks Ca Posts: 223	i gave the car a complete tune up not 500 miles ago (exept the O2 sensors) and i just therw the thermostat in and the KN and i still got crappy MPG... im gonna go get new o2 sensors today.... __________________ Mustang Sold 2003 Ranger Edge

03-14-2002, 01:07 PM	#9
Patrick Boetticher Registered Member Join Date: Feb 1999 Location: Camarillo/Thousand Oaks Ca Posts: 223	????