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mpj76 · 09-10-2002, 01:13 PM

I know most don't care about it but I'm curious anyway. My car is pretty much stock (1991 LX coupe 5.0 ex-FHP). My mileage in the city is around 19-20 mpg. On the highway at 70 mph its the same. What gives? Here is a list of relevant stuff done to the car. Odometer: 142000. 2.73 gear. 35 psi pressure in tires - 225 60R15.

Heater Core bypassed using bypass CAPS.
spark plugs, wires, distributor, coil - all new
Super Duty T5 tranny
Smog pump removed with relevant hoses.
AIR tube capped ater smog pump removal
Mass air meter and idle air bypass valce cleaned
MSD 6
160 thermostat - temp needle stays bet 1st & 2nd mark
K&N large cone filter
new 02 sensors

09-10-2002, 01:13 PM	#1
mpj76 Registered Member Join Date: Sep 2002 Posts: 158	mileage I know most don't care about it but I'm curious anyway. My car is pretty much stock (1991 LX coupe 5.0 ex-FHP). My mileage in the city is around 19-20 mpg. On the highway at 70 mph its the same. What gives? Here is a list of relevant stuff done to the car. Odometer: 142000. 2.73 gear. 35 psi pressure in tires - 225 60R15. Heater Core bypassed using bypass CAPS. spark plugs, wires, distributor, coil - all new Super Duty T5 tranny Smog pump removed with relevant hoses. AIR tube capped ater smog pump removal Mass air meter and idle air bypass valce cleaned MSD 6 160 thermostat - temp needle stays bet 1st & 2nd mark K&N large cone filter new 02 sensors Last edited by mpj76; 09-10-2002 at 01:41 PM..