Author Topic: road trip avg 33mpg...bad? (Read 10951 times)

///m42 sport · « **on:** August 23, 2008, 10:44:01 PM »

Just completed 1051mile trip w/o any problems. I'd say thats pretty good for 250K + motor/chassis.

I cruised at 70-75mph. Tires were 195-60. Pressure was 33front, 35rear. Recent change to mobile 1 synthetic 15w-50. Just passed emissions, also replace all coolant, air hoses.

I read on bp eastclear's site he was getting 45mpg hwy!

Anything else I could change that would provide significant increase in mpg? I did draft a semi for about 200miles but did not notice any major increase in economy. I was about 30ft behind it the whole time. Maybe I'm not doing it right?

318kid · « **Reply #1 on:** August 23, 2008, 11:48:29 PM »

Thats hyper-mileage right there.... The window sticker said 28 or 27 for highway... although they could have tested it differently back in 91? To me it seams that 45mpg is really hard to reach unless your going 50 on the highway.... Downhill.

AcSchnitzer318is · « **Reply #2 on:** August 24, 2008, 10:55:19 AM »

Only way to get that kind of mileage is to do 55-60mph AND draft a semi

christophbmw · « **Reply #3 on:** August 24, 2008, 11:52:37 AM »

Quote from: ///m42 sport;55370

Just completed 1051mile trip w/o any problems. I'd say thats pretty good for 250K + motor/chassis.

I cruised at 70-75mph. Tires were 195-60. Pressure was 33front, 35rear. Recent change to mobile 1 synthetic 15w-50. Just passed emissions, also replace all coolant, air hoses.

I read on bp eastclear's site he was getting 45mpg hwy!

Anything else I could change that would provide significant increase in mpg? I did draft a semi for about 200miles but did not notice any major increase in economy. I was about 30ft behind it the whole time. Maybe I'm not doing it right?

semis drive 70-75mph where you live?! holy sh#t! thats scary.

batsbats · « **Reply #4 on:** August 24, 2008, 12:57:30 PM »

I wish my car had cruise control, probably one of the only reasons I don't drive far with my 318is

tjts1 · « **Reply #5 on:** August 24, 2008, 01:46:55 PM »

Quote from: ///m42 sport;55370

Just completed 1051mile trip w/o any problems. I'd say thats pretty good for 250K + motor/chassis.

I cruised at 70-75mph. Tires were 195-60. Pressure was 33front, 35rear. Recent change to mobile 1 synthetic 15w-50. Just passed emissions, also replace all coolant, air hoses.

Thats excellent mileage for a stock car at 250k miles.

Quote from: ///m42 sport;55370

I read on bp eastclear's site he was getting 45mpg hwy!

I think you can safely file that claim in the bull **** folder.

Quote from: ///m42 sport;55370

Anything else I could change that would provide significant increase in mpg? I did draft a semi for about 200miles but did not notice any major increase in economy. I was about 30ft behind it the whole time. Maybe I'm not doing it right?

Try San Francisco to Irvine, CA (420 miles) on 12 gallons at 70mph, no drafting on 87 octane.
3.64 differential
4 hole 22# bosch injectors from a volvo
electric cooling fan
no power steering pump
forward facing intake
volvo airdam

Quote from: batsbats;55399

I wish my car had cruise control, probably one of the only reasons I don't drive far with my 318is

+1

Bunta · « **Reply #6 on:** August 25, 2008, 07:08:23 PM »

Put 600 miles on my car this weekend going to E30 M3 SIG Fest.

32mpg. Mileage went down once I got on the higway trying to hang with 15 e30 M3s.

I need BOOST.

Hunter

Danny707 · « **Reply #7 on:** August 25, 2008, 09:05:29 PM »

Keep in mind your motor is old, and tired.

bmwman91 · « **Reply #8 on:** August 26, 2008, 09:44:25 AM »

33mpg is pretty damn good. A 45mpg claim sounds pretty suspicious.

Hey tjts1, what model did you pull the injectors from? The stockers are 20.4# IIRC, so I guess the ECU was able to cope with the bigger ones without issue. I might look into some for the 4-pintle action.

tjts1 · « **Reply #9 on:** August 26, 2008, 11:29:25 AM »

95-98 Volvo 960. Bosch number 0280155702

TheDutch · « **Reply #10 on:** March 07, 2009, 04:09:58 AM »

Quote from: ///m42 sport;55370

I read on bp eastclear's site he was getting 45mpg hwy!

Quote from: tjts1;55407

I think you can safely file that claim in the bull **** folder.

You might like to check how big those gallons are before throwing up about it. It works out to about 38 (US) mpg, which is both mighty fine, and plausible.

1991 E30 M42 · « **Reply #11 on:** March 07, 2009, 12:49:39 PM »

Driving 350 miles from my house to Virginia Tech, I average 31-32 mpd at 80mph, and it would be higher if I didnt have to go through the mountains.

PS. semi's on that route drive between 75-80 mph

Voluted · « **Reply #12 on:** March 11, 2009, 10:05:18 PM »

roughly 22mpg

I really drive the shit out of my car. That figure is mostly highway driving BTW at an average speed of 160km/h (100mph). I'll baby it for the next tank of gas and see what figure i pull.

318isfolife · « **Reply #13 on:** March 20, 2009, 01:51:36 PM »

Quote from: christophbmw;55395

semis drive 70-75mph where you live?! holy sh#t! thats scary.

if you go out into the mountains of west Virgina the truck drivers that haul chickens go around 95 miles an hour on a two lane road now that is scary! when they pass you going the opposite direction it about blows your car off the road. crazy chicken driving shits.

sorry to hijack the thread with this comment!

B318M42W · « **Reply #14 on:** March 20, 2009, 04:28:19 PM »

if you draft, you need to be really close... like under 10-15 feet from the semi... tried it and had about an increase in economy of about 8mpg. but it is hard to keep it there...