My 1998 Nissan gets 30 mpg- perhaps 26 or so with city driving
my 2004 gets 16 mpg city- 18 highway.
Tires are full- 35 psi both vehicles Air filters clean, new fuel filters every year (6-10,000 mi) Oil changed every 4,000 miles. Dealer injector clean/fuel system service recently on 2004 Frontier at dealers recommendation- no improvement in mileage noted.
Dealership only came up with injector clean service... no other positive suggestions. My fear is they are avoiding fuel or oxygen sensor replacement under dealer warrantee- something like that. (however engine does idle smooth and run very smooth, slight tendency to knock on hills with some brands of gas (that I now avoid using.)
2004- 40,000 miles bought it when it was 32,000 miles last year. step on accelerator- hesitates at all speeds, worst when at a standstill- very sluggish1998- 140,000 miles, I am the original owner- 2nd set of tires ( first set lasted 100,000 miles), third set of plug wires, 4th set of spark plugs, 4th of 5th distributor cap, rotor, step on accelerator- always had lots of pep. even from a standstill, except on steep inclines
ideas? plugs? points, wires? Did all that myself when the 1998 needed it and it never got mileage so poor as the 2004 Frontier, so I doubt that would be the improvement..... Thanks
Paul