wow,im getting approx 275-280 miles per 18 gl. tank,and my car is not running right,its got cold start issues,hesitations,popping in plenum when cold,i thought that 280 miles was pretty decent for a crappy running car,im only running it on 89 octane,not the suggested 91 like the book says,ive noticed it runs fine on 89 octane,no knocks,no pings,no preignision,i think these cars are supposed to average 24 miles per gallon on the highway,when running correctly.check you 02 sensor,it effects proper air fuel mixtures and can reduce fuel mileage.also .you may want to do an ohm or milliamp test on your E.H.A,this is used for accurate cold starts,but you will be surprised how it can effect the cars all around fuel issues.

hey mlozzi, I hate to say it, but I do average about 280-300 on a 14.5 gal tank. so I guess I am doing pretty good

__________________

1990 190E 3.0L

Compression test is a effectively a test of how air tight your engine's cylinders are.

As an engine is effectively moving air in compressing it - igniting with a mixture of fuel and then blowing it all out again - the less it leaks the better.

See

http://www.ehow.com/how_5913286_do-compression-test.html

A leak down test is similar but gives you a bit more information about the health of the engine as it helps identify which bit is pants...

See

http://en.wikipedia.org/wiki/Leak-down_tester

This is good advice if everything else fails but first just check the distance you are actually traveling first on those new big tires of yours!

Don't PANIC

Since this kind of stuff demands utmost accuracy, I would be remiss if I didn't point out that the stock tire size is 185/65-15 not 185/60-15. So that makes the difference between what the odo is geared for and what we actually have now with the 205/65-15s slightly smaller. (I realize you were just using the sizes supplied by Ismalley.)
Regards, Eric

__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.

Oh dear! That is good to know - how did you get on with your measuring GPS experiment lsmalley?

I still think this is the best place to start - you need to know what you are using and how far you are going before you start looking for other solutions.

Agreed.
Regards, Eric

__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.

I did not leave yet but I will keep you updated.

__________________

1990 190E 3.0L