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On the 280 Z you could adjust the spring loaded flap on the air flow meter. Increase the spring tension and the car ran lean. Then add a rheostat in the water temp circuit that fooled the ecu into thinking the water temp was lower than it actually was. Mount the rehestat in the dash and you had dash adjustable mixture control by simply turning the knob.
This was in the late 1980s. At the time fuel economy was not much of a consideration.
Under the same (or close to it) conditions one car mag tested the 84 Crx 1.3 and got 73 MPG at 55 MPH. That CRX was bone stock. I bought a 1.5 CRX brand new The serial number was 1015, built in July 83, first months production. I was 32 when I bought that car. I averaged 44 MPG in that CRX for 50,000 miles, even commuting to work in Washington DC area traffic.
Based on the difference in cost of fuel (premium versus regular) in my area drivng my Fiesta under the same testing scenario as pgfpro my cost per mile would be very close to the same he achieved factoring in the cost difference between premium and regular fuel.
The differenceis his car is technically (based on my understanding of the legal situation) illegal, while mine is stock, passes current emissions and it is also an automatic, which my wife can drive if she had to.
This is not meant as an argumentive post. In my opinion it is a rational comparison of two cars, one totally stock with higher pressure tires, sidewall max at 44 PSI not 55-60 which I consider dangerous (his pressure). I run the cheapest regular gas I can find regardless of the source. Last tank with credit card discount was $3.049 a gallon.
regards
Mech
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