Hey I'm getting about 14 mpg in my 1990 BII 2.9L V6 and my dad wanted me to ask if thats about average and what I can do to improve upon that?

 

15 to 17 city 22-23 hwy

mobil I 5 or 10w 30
K&N air filter
flowmaster exh
stock tire size
stock plugs

it is hard to get any better g m in my opinion

 

If you have an automatic with the stock P205/75r15 tires, 15 mpg is about average, maybe 18 mpg on the highway.

If you have a standard, then you should be getting 18 average and 21+ on the highway. There are other topics on this.

 

I'm getting about 17-20 average with my truck in 2 wheel drive. This number includes city and highway (mostly highway) driving. 87 2.9L V6, manual transmission, P235 75 R15s. And I'm making sure to compensate for the difference from the stock tires.

 

i average 18-21 with mine and has 235-75-15's with a 5speed,mostly highway mileage.

 

My 89 with 4.11's and 30X9.50's and an A4LD used to make 20 MPG on trips out to Utah and Colorado. Before I regeared and when I had 3.73's it would just get a bit over 12 mpg. Went on a trip with two friends (one had a V-8 Tahoe and the other a V-8 full size Bronco) and they both put in less fuel at stops than I did. Seems to me these little Fords really like to stay very close to stock tire size and gear ratio to get good MPG.

Thing is if your running tires other than stock it can make your speedo a bit off. And not all 235's or all 205's are the same height. And speedo gears just get you close. So it depends on which speedo gear you go with after you put on larger than stock tires.

My 94 Sploder has 3.73's and 33's and the speedo gear I put in was the closest to actuall speed but actually reads a few miles an hour slow. 60 on the speedo is actually 62+ mph so I'm going farther than the odometer says. If I had gone the other way the odometer would read farther than I was actually going and I have a big jump in MPG.

Guess what I'm tryin to say is that even stock the odometers can be off a little. If your running taller than stock tires a speedo gear change may be needed or return to stock tires will give you back a bit. Or if you have the door sticker with stock tire size and axle gear ratio you may want to consider an axle gear ratio change. Just depends on how much larger tire you have now and what gear ratio you have and what gear ratios are available.

Hope this helps some. Good luck.

 

We checked our speedometer/odometer against dad's GPS to determine how far it was off. Also we checked the odometer against the mile markers on the side of the highway. Two good methods to determine how off your odometer really is.