In the summer or just with regular fuel 20$ at 3.99 a gallon yielded 100 miles almost everytime i got fuel. Now with extended warm ups and winter. Fuel I get around 70-80 miles around town with 20$. That is the same for my 235 tires and my 12.5" wide 32s, saw almost zero difference in mileage. Worn tires provide better fuel economy than new tires, up to 7% better fuel economy. Used lug drive tires can get up to 0.4 mpg better than new lug tires. Ribbed tires on the drive axles provide 2–4% better fuel economy than lugged tires. Every 10 psi that a truck’s tires are underinflated reduces fuel economy by 1%. The biggest thing I noticed that improved my mileage was adding a lightweight soft tonneau cover. It improved my mpg by about 2 on the hwy. Good luck, SPPD. 2013 Oxford White F-150 XLT 4X2 Screw 5.5 box EcoBeast ~ 301A, MaxTow 3.73 elct rear locker, XLT Chrome Pkg. (Bone Stock) ProPride P3. Before an oil change, always make sure that you get the right viscosity for your vehicle. Most vehicle owner's manuals state exactly what type of oil to use for optimum mileage, with names like 10W-30 or 5W-30. If you get the wrong oil you may notice a drop in mpg and overall poor performance, especially in extreme heat or cold. In the 2011 model year, Ford’s 6.2L V8 replaced the 6.8-liter Triton V10 and 5.4-liter Triton V8 engines in Ford’s Super Duty pickups. An upgraded 6.2-liter V8 engine came out in 2017 that can produce 385 hp (287.09 kW) and 430 lb.-ft. (583 N-m) of torque. With its lightweight design, the engine provides excellent fuel economy and performance. 6. Dirty throttle body. Dirty throttle body can also be the cause of slow acceleration in your Ford C-Max. The common signs of dirty throttle body are poor engine performance, erratic idle, the engine react poorly to movements of the accelerator pedal, and the engine sputters or stalls. Might want to sell that and get an F250 with a 351 and a ZF trans. 1987 - 1996 F150 & Larger F-Series Trucks - Poor performance and gas milage 1995 4.9 liter - I have a 1995 ford 1/2 ton 4.9 liter 5 speed, I bought this truck with 100000km (60000miles) on it. I have replaced the plugs, wires, cap and router, air fiter to a k&N, had a computer 2020 S-MAX II facelift 2019 | 2021 - to present. Modification Recommended fuel City consumption Highway economy Combined cycle Energy consumption; 2.5 Hybrid CVT hOFcG.